The string comparison functions epicsStrCaseCmp() and
epicsStrnCaseCmp() were returning incorrect results
when the strings did not match.
These functions now match their BSD equivalents, and
have working tests to confirm their operation.
Removed all Main.cpp files, use the macro in testMain.h instead and
defaulted all argc/argv parameters.
Converted all real test programs to use epicsUnitTest.h.
Moved performance measurements from epicsThreadTest to epicsThreadPerform.
Moved epicsOkToBlockTest tests into epicsThreadTest.
On a host arch, make test inside the O.arch directory runs all tests.
