docs: doc new types in user_guide; alphabetize types in reference.

user_guide.txt:

Removed Number from String and Number Properties.  Added new Integer
and Number Properties sections to the user guide. Number Proprty
formats defined: no thousand separators, '.' decimal separator,
supports scientific 2E4 style input. Ordered in rough order of use.

reference.txt:

Alphabetized the types in the reference manual for easy lookup.
Fixed sentence on quiet property.

Author: rouilj

doc/reference.txt

@@ -442,32 +442,32 @@ Properties
 
 A Class consists of one or more properties of the following types:
 
-String
-     properties store arbitrary-length strings.
-Password
-     properties store encoded arbitrary-length strings.
-     The default encoding is defined in the ``roundup.password.Password``
-     class.
+Boolean
+     properties store on/off, yes/no, true/false values.
 Date
      properties store date-and-time stamps. Their values are Timestamp
      objects.
+Integer
+     properties store integer values. (Number can store real/float values.)
 Interval
      properties store time periods rather than absolute dates. For
      example 2 hours.
-Integer
-     properties store integer values. (Number can store real/float values.)
-Number
-     properties store numeric values. There is an option to use
-     double-precision floating point numbers.
-Boolean
-     properties store on/off, yes/no, true/false values.
 Link
      properties refers to a single item selected from a
      specified class. The class is part of the property; the value is an
      integer, the id of the chosen item.
 Multilink
      properties refer to one or more items in a specified
      class. The value is a list of integers.
+Number
+     properties store numeric values. There is an option to use
+     double-precision floating point numbers.
+Password
+     properties store encoded arbitrary-length strings.
+     The default encoding is defined in the ``roundup.password.Password``
+     class.
+String
+     properties store arbitrary-length strings.
 
 Properties have attributes to change the default behaviour:
 
@@ -481,8 +481,8 @@ Properties have attributes to change the default behaviour:
     the list returned by calling get_required_props for the class.
   - ``default_value``: see `design documentation`_ Sets the default
     value if the property is not set.
-  - ``quiet``: see `design documentation`_. Suppresses user visible
-    to changes to this property. The property change is not reported:
+  - ``quiet``: see `design documentation`_. Suppresses reporting user
+    visible changes to this property. The property change is not reported:
 
     - in the change feedback/confirmation message in the web
       interface

doc/user_guide.txt

@@ -114,11 +114,24 @@ This means the web interface for entering a new issue, the web interface
 for searching issues, the e-mail interface and even the command-line
 administration tool.
 
-String and Numeric properties
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+String Properties
+~~~~~~~~~~~~~~~~~
 
 These fields just take a plain text value, like ``It's broken``.
 
+Number Properties
+~~~~~~~~~~~~~~~~~
+
+These fields take a real number with decimal point like ``+12456.78``,
+``-12456.78`` ``12456.78``. It supports scientific/exponent notation
+like ``3.1415E-2``. Decimal commas (e.g. ``123456,78``) or thousand
+separators ``-12,456.78`` are not supported.
+
+Integer Properties
+~~~~~~~~~~~~~~~~~~
+
+These fields take a whole/integer number without decimal marker like
+``123``, ``+123``, ``-123``. Exponents are not supported.
 
 Boolean properties
 ~~~~~~~~~~~~~~~~~~