Additional code review feedback and minor UI tweaks.

Additional code review feedback and minor UI tweaks.

Fixed $(DOTS) capitalization in Makefile.  Made some constant names
start with GPS_ for consistency.  Fixed more spaces-before-parenthesis
style issues I missed.  Removed notebook tab since we only have one
page.  Changed UI label font to be bold to match other plugins and
removed frame borders.  Changed order so GPS status goes on the right
and is floating with the window size.  This solves the issue with the
changing numbers making the other frames move around.  Increased number
of track points and track groups to be more reasonable instead of test
values.  Removed range ring code for now.  Fixed viewer_add sort boolean
per new semantics.