createmodel: show an existing model file directory in usage
createmodel: copy files LesHouches.in* if found in model file directory

They are installed by make install-src.
added adelade pre-print number to paper.
changed some of the commands using LesHouches files to refelct Jae-hyeon's update.
I didn't change all references to this though as the leshoucesh files inside
model_files/<model> directory are still there.
Not sure what is optimal way to describe in paper.
added reference from Moritz McGarrie to USSM list.  may not be entirtely appropriate.
removed pdf added by mistake.
added more references to non-decoupled D-term approach, citing the kaplan paper.
and Anibal Medina's paper.  there are probably many more.
removed pdf because it added again by mistake. doh
fixed order of refs I just added.
added Gregor Hellwig and Gambit to acknowledgements.
createmodel: simplify code to copy SLHA input files
Update ChangeLog
Adapt paper further to installation of LesHouches files
added s few of Roman's E6 custodial symmetry papers to manual,
since that is a really nice alternative formulation of the E6SSM and
can ~fit with our model files since we neglect many couplings.
added FlexibleFuture.txt to doc directory.  Contains updated list of (possible)
future extensions, collaborations, fixes, applications.
Added for others to extend  if they have ideas before we discuss this
after the dust has settled on first FlexibleSUISYDproject.
fix typo
updated pulication info for nmssm-softsusy.
update FS version number in download instructions to 1.0.1

Version 1.0.1 fixes a `make install-src' bug.
return the scale (if available) from read_block()
adding helper function which checks if a block exists