ptMon-All: generalized a bit

Removed full path call of gnuplot, pushing that responsibility to caller.
So, I also added a checks to make sure gnuplto and other called scripts
are in the PATH.
Merge branch 'dev' into nu-ptmon

Pulling dev to incorporate new Satellite Plot scripts.
Merge branch 'dev' into nu-ptmon

Pulling upstream recent work mkRIN, just to stay updated.  Getting ready
automate mkRIN very soon.
ptMon-pvtSatNum: Bug Fixes, etc.

Some things didn't work correctly on neutrino.
ptMon-All: Added pvtSatNum plotting

Incorporated pvtSatNum plotting script to the ptMon wrapper (all).
mkRIN: Generic time constraints

Added the ability to specify time limits (--begin,--end) parameters
that additionally limit the selection of SBF files.

Also, fixed some bugs with configuration checking.
ptMon-pvtSat: fixed spurious output from expr
Merge branch 'nu' of file:///home/pdestefa/local/src/samples into nu-ptmon

Pulling in changes to mkRIN so I can start automating from this directory.
mkRIN: Improved timing accuracy

Changed the way time specifications are converted into criteria for
finding SBF files on which to operate.  This makes more accurate
time specifications possible.
mkRIN: fixed ambiguous year in date spec

Last commit introduced a bug in that the year was assumed to be the
current year.  This fixes that.
mkRIN: fixed major bug in xPPSOffset extraction

Oops.  xPPSOffset extraction program was configured as PVTGeo extraction
tool.  This commit fixes that.
ptMon-pvtSatNum: relaxed plotting range, no max y

Max y range value was not helpful, so I let it be auto, now.
Major Update: new RxClkBias & Better Timing

ptMon-clkBias.sh is the new script that plots RxClkBias.  It uses enhancements
to pt-plotgen.gpt.  These enhncements include explicit maximum X-range and no
x-range (auto).  I also updated ptMon-pvtSatNum.sh to use these new timing
features, also.
pt-plotgen: Incompatible Change

A change introduced in the previous commit caused it to mailfunction
when 'call'ed (instead of loaded) and when passing complex plotting
commands (i.e. using 3:($2*10)) because $# is replaced when 'call'ed.
To fix this, I've implemented a backward compatible hook for the
usingCSV option and conerted the newer scripts to the 'load' method.

ptMon-rxClkBias: Also, this commit fixed a serious bug in the plotting
of rxClkBias data: the scale was not adjusted for nanoseconds.
Merge branch 'nu-ptmon' into nu

Conflicts:
	ptMon-pvtSatNum.sh
Resolution:
        Kept all from nu branch
pt-plotgen: Disabled debug statment
pt-plotgen: Disabled debug statment
Merge branch 'nu-ptmon' into nu
Finalized clkBias, pvtSatNum, and fixups
Merge branch 'nu-ptmon' into nu