Update of Mesh loading / saving, code cleaning.
Fix in subdomains saving.
Runge-Kutta: propagate verbose_output.
Do not evaluate block_scaling_coeff when not necessary.
Delete ENABLE_VIEWER_GUI macro, drop the untested, outdated functionality.
Documentation update. Make the newest UMFPACK work.
Update of examples.
Add .gitignores.
Progress on documentation.
Few more documentation updates.
Move the initial check of meshes to all subdomains (including the "whole domain" ones).
Work on documentation.
Progress on documentation.
Amendments to subdomains loading.
Progress on documentation.
Fix remaining small memory leaks - fixes #76.

Conflicts:
	hermes2d/src/api2d.cpp
	hermes2d/src/discrete_problem.cpp
Fix of subdomains.

Conflicts:
	hermes2d/src/discrete_problem.cpp
Fix the merge & remove last occurences of ENABLE_VIEWER_GUI.
Tweaks of linearizer, vectorizer.
Few fixes.