Changes and New Features in Version 1.5

A preliminary C interface (see Appendix 5) has been added.
MSG_LOAD has been modified to remove an intermediate buffer which restricted the length of the message which could be handled.
In msg_par, the maximum size of a message (MSG__SZMSG) has been increased from 200 to 300 characters.
In err_par, the maximum size of a message parameter name has been corrected to 15 (from 200).
An installation test for the C interface has been added to the test target in the makefile.