Description:
Fixed CommonFG::getComment and CommonFG::getLinkval to provide
default values for buffer size to improve usability.
Added test file tlinks.cpp, which only contains test for getLinkval
and will expand when C++ wrappers for H5L functions are implemented.
Platforms tested:
Linux/32 2.6 (jam)
FreeBSD/64 6.3 (liberty)
SunOS 5.10 (linew)
