modify to allow use of px written in `C' and the use of libpc

modify to allow use of px written in `C' and the use of libpc

modify to allow use of px written in `C' and the use of libpc

modify to allow use of px written in `C' and the use of libpc

fix bracketing around scalar convert for comparison

output set pairs in same order for px and pc so can use libpc

output set pairs in same order for px and pc so can use libpc

fix printout bug in listing REL*

Perror writes to stderr

malloc returns 0 on out of memory, not -1 as in version 6.

malloc returns 0 on out of memory, not -1 as in version 6.

malloc returns 0 on out of memory, not -1 as in version 6.

malloc returns 0 on out of memory, not -1 as in version 6.

malloc returns 0 on out of memory, not -1 as in version 6.

malloc returns 0 on out of memory, not -1 as in version 6.

mark the built-in procedure dispose as non-standard

fix so that local variables are accessible from sdb

eliminate 65k restriction

fix perror not to try to write sys_errlist (wnj)

remove the last references to sccs for the distribution.

add warnings for extensions to language

add warnings for extensions to language

add warnings for extensions to language

add warnings for extensions to language

round up size of arguments for NARGCHK call.