[Gpsbabel-code] test-all resurrection

[tsteven4 <tst...@gm...>]

test-all is finding serious issues:
31 return codes of 134, sigabrt, all with -i lowranceusr4
1594 return codes of 139, sigsegv:
     1522 with -i pocketfms_wp
     54 with -o enigma
     18 with -o naviguide
-----------------------------------
out of 7626 tests

so 1625 tests (21%) show serious issues.  it may only boil down to 4 
bugs involving 4 formats.

only 2575 tests (34%) return error codes of 0.  the rest have other 
issues, possibly false failures.

Bortel Lazslo has recently demonstrated another sigsegv not caught by 
test-all that should be easy to fix.