[GEOT-4491] Hints.getDefault() implementation hampers scalability
[GEOT-4492] DataUtilities.fileToURL checks system variable fo OS every time, hampering scalability
[GEOT-4493] CRS repeated checks for axis flipping system variable hampers scalability
GeoTools hints map needs to be accessed via RenderedHints.Key, not string
Merge pull request #213 from aaime/scalability

Scalability related improvements