Added some conditional-related material to GOTCHAS section.

Fixed bug which allowed the condition variable to be prepended or followed by ...

any string.  Instead of testing for a match anywhere in the field, the program
now makes sure the field begins and ends with a variable dereferencing.
Changed semantics of environment variable processing in existential conditionals
to match that of user-defined variables: the condition test is true if the
variable is simply defined, regardless of the value of the RHS.

Added string constants for commonly used text strings.

Replaced "True" and "False" in the conditionals with "Yup" and "Nope" ...

so there is no confusion that the conditional is actually parsing
boolean logic - it is not, it's only doing string comparisons.

Restructured and cleaned-up the conditional beginning-of-block parsing logic. ...

Fixed bug in wildcard processing that returned the previously selected set
if there were no wildcard matches.  Now no matches returns no selections.

Added some new GOTCHA sections.

Fixed incorrect Directory Shortcut definitions for Win32.

Added new sorting options and associated sort key bindings. ...

Rewrote the example configuration at the end to include
Directory Shortcuts, Wildcards, all forms of Conditionals
and Nested Conditionals.

Minor cosmetic comment change.

Changed sort key binding names to be more meaningful.

Fixed problem which kept indented conditional lines from being properly handled.

Fixed problem which prevented navigating to selected drive in Drive List View. ...

Fixed problem in which the sort type was incorrectly displayed on first entry
into Drive List View.
Changed Drive List View sorting logic slightly to make it cleaner.

Drive List View sorting and Sort Menu finished.

First implementation of Sort Menu.

Titlebar now show correct info in Drive List View - proper ...

sort field name is shown and the 'Sep' information is
dropped because it is not meaningful in this view.

Implemented sorting for Drive List View ...

Changed format of Drive List View display

Added ability for all conditionals to reference environment variables.

Finished first complete implementation of conditional ...

processing in the Configuration File using ==, !=, and variable existence.

Removed debugging print statement in the conditional logic. ...

Program now allows User-Defined Variables to be re-defined.
Conditional keywords changed to: .if and .endif.

Now catches .ENDIF statements which are not on a line by themselves. ...

Added missing error message and made error messages concerning
conditionals a bit clearer and more consistent with other error message formats.

Implemented variable existence conditional in Config File parser.

Changed CMDSHELL/wildcard escape to '"' from '#'.

Changed escape char for CMDSHELL and wildcard processing to use " instead of #

Finished sorting logic. Fixed bug with Win32 case collapse. ...

Changed arithmetic in poll() which sets reduced period for
next refresh if a locked mutex is encountered.

Implemented support for fNONE - no sorting.

Changed SORTBYFIELD to be the *name* not the number of the field desired. ...

Check SORTBYFIELD to see if it makes sense.  If not, it is hardwired to fNAME.

Inlined the sort routine into BuildDirList(). ...

Added title bar information about current sort.

First implementation of sorting algorithm. ...

Keyboard support and title bar display for sorting implemented.

More work on sorting.

Restructured code to prepare for enabling sorting by various fields. ...

Added SORTBYFIELD and SORTREVERSE options.
This restructuring speeded up display calculation considerably.