A bunch of uninteresting changes to make icc (and presumably other

A bunch of uninteresting changes to make icc (and presumably other
edgfe-based tools) whine less.

coastexp: fix bounds violation on monthString
delgpl: fix error text on fatal()
geoniche: tweak terminator
google: make seial an int, not long.
gpx: include xmlgeneric
lowrance: fix signedness writing waypoint count
mapsource make le_f(read|write)64 explictly void
nmea: add gratituous initialization
overlay: explicitly zero zome values
position: bloat 'nop' functions to eliminate need for cast.
shape: close->SHPClose.   misc warning fixes
tpg: include ctype
xmlgeneric.h: add many protos.