Coverity fixes from Nelson

Coverity fixes from Nelson

* merges:
  CID:122 - NEGATIVE_RETURNS - Possible use of negative file descriptor
  CID:123 - NEGATIVE_RETURNS - Possible use of negative file descriptor
  CID:124 NEGATIVE_RETURNS - Possible use of negative file descriptor.
  CID:125 - NEGATIVE RETURNS - Possible use of negative file descriptios
  CID:135 - NULL RETURNS - Possible NULL pointer dereference
  CID:182 - RESOURCE_LEAK - memory not freed inside Prolog_functions
  CID:192 RESOURCE_LEAK - new argv is not freed
  CID:226 SECURE_CODING - risky use of strcpy
  CID:226 - SECURE_CODING risky usage of strcpy
  CID:228 SECURE_CODING - risky usage of strcat
  Fix last commit of CID:228 SECURE_CODING - risky usage of strcat
  CID:230 SECURE_CODING - risky use of strcpy
  CID:232 SECURE_CODING - risky usage of strcpy
  CID:241 SECURE_CODING - risky usage of sprintf
  CID:318 SECURE_CODING - risky usage of sprintf
  CID:340 SECURE_CODING - risky usage of strcat
  Added sxe-utils.h with several utilities from lisp.h
  CID:475 USE AFTER FREE
  CID:179 RESOURCE LEAK - free string in odd case