FMSLogo Code

Refactoring: Add comments to wrap_* functions.
Replace > operations with equivalent < operations.

Work around a wxWidgets bug where wxDC::DrawPoint() draws two
pixels under GTK3. On this platform, a zero-pixel line is drawn
instead. This is not quite correct and causes some anti-aliasing
which bleeds into the pixel, but it's better than before.

Add a regression test to ensure that WRAP does not limit the distance that FORWARD is permitted (opened as bug #487)

Update a bug number to use SourceForge's new numbering scheme.

Rewrite SETPIXEL and PIXEL in terms of platform-independent wxWidgets function calls so that the work on GNU/Linux.

Replace usage of the win32 POINT struct with wxWidget's wxPoint. This makes the code more platform-indepenent although, by itself, doesn't make any new functions availabe on the GNU/Linux build.

Formally thank Peter De Watcher for opening a bug report on gcc
that caused logomath.cpp to fail to compile when optimizations
are enabled. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71020

Fix a class of warnings that is emitted by recent versions of g++:
warning: invalid suffix on literal; C++11 requires a space between literal and string macro [-Wliteral-suffix]

Fix a macro redefinition warning when compiling on Fedora Core 25.

Fix Bug #485; Remove the synopsis for EDIT taking zero inputs. There is some behavior for this in UCBLogo (re-opening the same file as used in a previous EDIT call), but since FMSLogo also deletes the temp file after closing, this behavior doesn't make sense in FMSLogo. Instead of trying to add it, I decided to document the existing behavior.