This adds options which are user enabled to debug the LRU cache inside
ColumnStore. Specifically cache flushing.
It adds the following:
* PrimProc flush information when SIGUSR2 mode is enabled
* cpimport dictionary flush information when -d2 is used
* WriteEngineServer DML flush information to STDERR
* 64KB TEXT column had off-by-one length pointer counting
* TEXT I_S/LDI was looping where it shouldn't causing pointer issues
* TEXT data type wasn't fully understood by cpimport
* TEXT and BLOB now have separate identifiers internally
* TEXT columns are identified as such in system catalog
* cpimport only requires hex input for BLOB, not TEXT
* DML writes for multi-block dictionary (blob) now works
* PrimProc fixed so that the first block in multi-block is read
correctly
* Performance optimisation (removed string copy into stack) for new
dictionary entries
Remove generated Makefiles
Update Makefile.am to specify RPATH as a subdirectory of --prefix
Remove configure artifacts such as config.log, config.h, etc
Remove unneeded backup files (files ending in tilde ~)
