* Optimizations to FIF.cc. Unnecessary file header reading is now avoided as top
  level IIPImage class cache fully utilized. Cleanup of constructor code of IIPImage,
  TPTImage and KakaduImage code. Significant speed up to requests of cached images.
* Modification to if_modified_since code in FIF.cc, to avoid repeatedly resetting the
  timezone environment variable to UTC when checking timestamps, which is a relatively
  slow process. This is now set once globally in Main.cc and set back on main exit.
Fix to configure.in for libmemcached configuration problem on Fedora.
Fix to KakaduImage.cc to enable correct handling of bilevel images.
Fix to quality layer decoding - variables moved directly into IIPImage class
Scaling of 8 and 16 bit spectral data to normalized 0.0->1.0 float in SPECTRA.cc
Merge https://github.com/cmarmo/iipsrv
Fix to JTL.cc and TPTImage.cc for multispectral sequences consisting of images of different bit depths.
Moved setenv/unsetenv function definitions to Main.cc where they are now needed following movement of timezone setting code there.
* Fix to OpenMP code in Transform.cc for compatibility with Intel compiler - thanks Emmanuel Bertin.
* Addition of extra timing output in JTL.cc
Added PFL command for obtaining raw X profiles of data. Syntax is <resolution>:<x1>,<y1>-<x2>,<y2>. Only horizontal profiles are supported so far.
Fix to previous commit
Modified PFL command to use JSON and implemented vertical profiles.
Updated PFL command to also handle multi-spectral data
Modified PFL to handle single points as well as profiles. Thus syntax for single points: PFL=<resolution>:<x>,<y> and for profiles PFL=<resolution>:<x1>,<y1>-<x2>,<y2>
Bug on JET colormap fixed.