Modernized extended operations.

Modified: src/pointer-stack-extended.c
Fixed incorrect handler

Modified: src/pointer-stack-extended.c
Error uses register variable

Modified: src/pointer-stack-extended.c
Fortified IO

Modified: src/pointer-stack-io.c
Modified: src/pointer-stack.c; Added a new convenience macro.
Hardened life cycle

Modified: src/pointer-stack-lifecycle.c
Modernized limitation

Modified: src/pointer-stack-limitation.c
Standardized optimization, private, protection

Modified: src/pointer-stack-optimization.c
Modified: src/pointer-stack-private.c
Modified: src/pointer-stack-protection.c
Corrected syntax error

Modified: src/pointer-stack-optimization.c
Added range error

Modified: src/include/pointer-stack.h
Modified: src/pointer-stack-io.c
Modified: src/pointer-stack.c
Acknowledge range error invalid by sub constant logic

Modified: src/pointer-stack.c
Acknowledge stack limited error

Modified: src/pointer-stack.c