2014-11-17: rename most instances of bracket to parenthesis.

rename most instances of bracket to parenthesis.

diff --git a/docs/srfi.org b/docs/srfi.org
--- a/docs/srfi.org
+++ b/docs/srfi.org
@@ -255,14 +255,14 @@ The syntax shown here is the minimal syn
    
 *** Unindented line
 
-*A line without indentation is a function call*, just as if it would start with a bracket.
+*A line without indentation is a function call*, just as if it would start with a parenthesis.
 
 #+BEGIN_SRC wisp
     display "Hello World!"      ;      (display "Hello World!")
 #+END_SRC
      
 *** Sibling line
-*A line which is more indented than the previous line is a sibling to that line*: It opens a new bracket.
+*A line which is more indented than the previous line is a sibling to that line*: It opens a new parenthesis.
 
 #+BEGIN_SRC wisp
     display                              ;    (display
@@ -270,7 +270,7 @@ The syntax shown here is the minimal syn
 #+END_SRC
      
 *** Closing line
-*A line which is not more indented than previous line(s) closes the brackets of all previous lines which have higher or equal indentation*. You should only reduce the indentation to indentation levels which were already used by parent lines, else the behaviour is undefined.
+*A line which is not more indented than previous line(s) closes the parentheses of all previous lines which have higher or equal indentation*. You should only reduce the indentation to indentation levels which were already used by parent lines, else the behaviour is undefined.
 
 #+BEGIN_SRC wisp
     display                              ;    (display
@@ -280,7 +280,7 @@ The syntax shown here is the minimal syn
 
 *** Prefixed line
 
-*To add any of ' , ` #' #, #` or #@, to the first bracket on a line, just prefix the line with that symbol* followed by at least one space. Implementations are free to add more prefix symbols.
+*To add any of ' , ` #' #, #` or #@, to the first parenthesis on a line, just prefix the line with that symbol* followed by at least one space. Implementations are free to add more prefix symbols.
 
 #+BEGIN_SRC wisp
     ' "Hello World!"      ;      '("Hello World!")
@@ -288,7 +288,7 @@ The syntax shown here is the minimal syn
 
 
 *** Continuing line
-*A line whose first non-whitespace characters is a dot followed by a space (". ") does not open a new bracket: it is treated as simple continuation of the first less indented previous line*. In the first line this means that this line does not start with a bracket and does not end with a bracket, just as if you had directly written it in lisp without the leading ". ".
+*A line whose first non-whitespace characters is a dot followed by a space (". ") does not open a new parenthesis: it is treated as simple continuation of the first less indented previous line*. In the first line this means that this line does not start with a parenthesis and does not end with a parenthesis, just as if you had directly written it in lisp without the leading ". ".
 
 #+BEGIN_SRC wisp
     string-append "Hello"        ;    (string-append "Hello"
@@ -298,7 +298,7 @@ The syntax shown here is the minimal syn
 
 
 *** Empty indentation level
-*A line which contains only whitespace and a colon (":") defines an indentation level at the indentation of the colon*. It opens a bracket which gets closed by the next less-indented line. If you need to use a colon by itself. you can escape it as "\:".
+*A line which contains only whitespace and a colon (":") defines an indentation level at the indentation of the colon*. It opens a parenthesis which gets closed by the next less-indented line. If you need to use a colon by itself. you can escape it as "\:".
 
 #+BEGIN_SRC wisp
     let                       ;    (let
@@ -309,7 +309,7 @@ The syntax shown here is the minimal syn
 
 
 *** Inline Colon
-*A colon sourrounded by whitespace (" : ") starts a bracket which gets closed at the end of the line*.
+*A colon sourrounded by whitespace (" : ") starts a parenthesis which gets closed at the end of the line*.
 
 #+BEGIN_SRC wisp
     define : hello who                    ;    (define (hello who)
@@ -317,7 +317,7 @@ The syntax shown here is the minimal syn
         string-append "Hello " who "!"    ;        (string-append "Hello " who "!")))
 #+END_SRC
 
-If the colon starts a line, it starts a bracket which gets closed at the end of the line *and* defines an indentation level at the position of the colon.
+If the colon starts a line, it starts a parenthesis which gets closed at the end of the line *and* defines an indentation level at the position of the colon.
      
 *** Initial Underscores
 *You can replace any number of consecutive initial spaces by underscores*, as long as at least one whitespace is left between the underscores and any following character. You can escape initial underscores by prefixing the first one with \ ("\___ a" → "(___ a)"), if you have to use them as function names.