Exposed libptools library interfaces for customer use

1. Symbol lookups, with all appropriate relocations considered, based on recorded artifacts: for example, gensyms, genld -l and process listing data. I can do this now with a pure Perl implementation I wrote, but that implementation is slow compared to what is possible from a C library implementation.

2. Live symbol lookups against running processes.

For these, the return data structure I'd want would include at least the following: (a) requested address (b) requested PID, if applicable (c) Object (d) Object start address and length (e) Symbol name, start address and length (e) Offset, the requested addresses minus symbol start (f) Source File. My own implementation also includes the data about the non-relocated symbol data found in the gensyms output. I'd want to make sure I had an interface to do this which works silently (does not write to stdout or stderr).

Having never had an interface to libptools.a, some clever Bloomberg developers had written some of their own routines for live lookups on AIX, specifically to do stack decoding, but I am more interested in seeing a supported first-party implementation. To my knowledge, I'm the only one attempting symbol lookups based on historical data.

The other UNIX flavors: Solaris and Linux have good answers for looking up the live data, but not for historical.