Added a cache of VARINFO and TRANSINFO
Renamed infocache to not be transform specific, since it may be used for other things in the future
Fixed a free bug and added comments reminding us not to free infocache varinfos
Moved the infocache code to its own file
Extended infocache to support both physical and logical varinfos, so as to not mix them up
Updated Autotools
Merge branch 'adios-query' into infocache
Merge branch 'infocache-final' into adios-query

Integrating the common layer infocache, which should greatly speed up reads on files with many PGs.