add missing commands to man page

Add documentation for SEND* commands (SENDLIST, SENDUNLINKED,
SENDHELP, SENDINFO, SENDQUERY).
added test that flushes out signed-ness problems
Merge branch 'feature/signtests' into develop
use off_t for seek and tell operations
fixed use of wc
Additional tests

- Move packet merging test from 05-areafix... to 03-crashmail....
- Added routing test.
Add history entries History.txt

- Add history entries for recent releases to History.txt
- Reformat History.txt using Markdown
inc version number
Release 0.88

- This release fixes an integer sign issue affecting osTell() and osSeek().
- The test suite now tests packet merging and packet routing
- The history file has been updated to reflect changes in the 0.8x series.