getparam: buffer overflow

[teuben]

Example:
ccdfits model.10.smooth model.10.fitsradecvel=t
*** buffer overflow detected ***: terminated
Aborted (core dumped)

seems the (wrong in this case) keyword is too long

[teuben]

This was a short MAXKEYLEN temporary buffer that was too short. Made it 64, changed strcpy -> strncpy to protect, but a few traps like this remain in getparam. Marking this is almost done.