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tf198's changes

Fixes for Decimal, Integer, DateTime, DropDown and CheckBox fields
Allowing override of input type in Text widget (for extended HTML5 types: date url etc...)
Changed how values passed via $data parameter are handled so there is a symmetric relationship between it and the validated output of Phorm::cleaned_data(). Before you couldn't display a form for stored data because certain fields like Phorm_Field_Date were populated by one type (string) and returned another (unix timestamp). All such fields should now provide an export_value($value) method that performs the inverse of import_value($value).
Added Range and IPv4Address fields

Removed client side validation to keep this library focused on PHP (not javascript)
Added Alpha/Alphanumeric field type
Added OptionGroup (multi-select checkbox) field type

Made sure the examples (in the examples folder) were working as expected and that the code was clean.
Note that the original branch developer has been contacted but has not responded -- this branch should probably be considered the most active.

Changed name of Phorm_Field_Numeric to Phorm_Field_Integer because that's what it is (numeric is misleading because php's is_numeric() function checks for any kind of number, not just integers).
Added $size parameter to Decimal and Integer field types instead of hard-coding "20".
Simplified built-in 'required' validation (just add 'required' to any field's validation array) [Implementation Details: I removed the "Validation.class.php" file because it made no sense, and replaced it with a simple built-in function that is automatically called when is_valid() is called if the validation array contains 'required'].
Changed default form method from 'get' to 'post' in the Phorm_Phorm constuctor ('post' is a more common use case so it should be the default)
Added a display_errors() function that can be called on your phorm object to output a list of all field errors -- useful if you want to display all errors at the top of the page instead of inline with each feild.
Added a new public fields() function to Phorm_Phorm class so all field objects can be retrieved and looped through.
Text and Integer fields now set HTML maxlength attribute based on $max_length param (in addition to existing server-side validation check).
Bugfix: The is_valid() function in Field.class.php now works with instance callbacks as well as function names, to match documented behaviour.

Added new designed_form.php example to demonstrate how to use the class in your own templated / designed HTML form (as opposed to an auto-generated table), and to show off the new display_errors() and fields() functions.
Removed getIterator() function in Phorm/Phorm.class.php becaue it wasn't doing anything (class doesn't implement IteratorAggregate)
Removed leftover debugging call to var_dump() in Phorm/Field/Email.class.php
Cleaned up some function comments in Phorm/Field.class.php
Removed docs/ directory because it was autogenerated before I made all of these changes, so it was out of date (and I haven't re-generated it with phpDocumentor yet).
Added constant for target directory to the file_drop.php example