[teqc] new options for next teqc release

[Lou Estey]

By user request, and functionality that I've been considering for
a while, the next teqc release will have two new options:

-O.-obs
-M.-obs

which will allow you to specify which observables that you want to
drop if they are present on input for RINEX-to-RINEX or by default
for raw-to-RINEX.  Examples:

You want to eliminate RINEX "C2" if it exists in RINEX obs 2.11:

teqc -O.-obs C2 in.obs > out.obs

You want to eliminate the rain and hail indexes in RINEX met 2.11
during translation (because RI and HI are now "on" by default to
automatically accommodate Vaisala WXT510 and WXT520 met packs):

teqc -M.-obs ri+hi +met out.met in.raw > out.obs

Caveat: you can't use both -O.obs and -O.-obs in the same command,
or both -M.obs and -M.-obs in the same command.  Whichever shows
up first is the one that is used.

If anyone wants to try an interim build of teqc with this functionality,
please let me know (_and_ please send the build line from `teqc +id`).

cheers,
--lou

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Louis H. Estey, Ph.D.              office:  [+001] 303-381-7456
UNAVCO, 6350 Nautilus Drive           FAX:  [+001] 303-381-7451
Boulder, CO  80301-5554            e-mail:  lou  unavco.org
    WWW:  http://www.unavco.org   http://jules.unavco.org

"If the universe is the answer, what is the question?"
                                                -- Leon Lederman
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