Expanded vector function handling, added functions mean(), sum(), vmax() and vmin().
Remove some extra print statements from expression parser.
Fixed bugs in implementation of testselect program
testcustomtransport: close socket on disconnect.
Added make tests option for running all tests in sequence; modified tests for simpler text output but with verbose option flag.
Merge branch 'more-vector-functions'

Conflicts:
	src/expression.c
	test/testparser.c