Set app version and minimum db version

Set app version and minimum db version and add new preferred habitat
class user setting.
Amend dataset design to add/remove tables

Amend dataset design to add new lut_habitat_type_ihs_habitat table and
remove unused lut_ihs_category table.
Add new preferred habitat class to user options

Add new preferred habitat class to user options interface.
Add new habitat class and habitat type fields

Add new habitat class and habitat type fields to user interface, remove
unused ihs category and nvc category fields, and amend associated
program logic.
Add new converter class for habitat type code

Add new converter class for habitat type code used by Habitat Type on
IHS tab and on Source tab.
Amend dataset design to add is_local flag

Amend dataset design to add is_local flag to lut_habitat_class table.
Handle new preferred habitat class in user options

Load and save the new preferred habitat class in the user options.
Set preferred habitat class and use is_local flags

Set the preferred habitat class when first loading the field and only
load habitat classes and types that have the is_local flag set.
Add comments to code for CR29 and CR32

Add comments to code for CR29 and CR32.
Adjusted left margin on editable comboboxes

Adjusted left margin on editable comboboxes.
Make habitat type combobox editable

Make habitat type combobox editable so users can type in codes as well
as use drop-down list.
Changes to version number and readme files

Changes to version number and readme files.
Update fix comment

Update fix comment.
Release HLU Database Updater mutex after checking

Release HLU Database Updater mutex after checking.