Small fix in BIH tree.
Fix test 22 under Cygwin.

- add using of Python under Cygwin
Merge remote-tracking branch 'origin/JSI_bddc'
Remove compiler warnings.

- remove base warnings generated during compilation without -W flags
Remove compiler warnings.

- remove warnings generated by -Wsign-compare flag.
Merge branch 'master' of github.com:flow123d/flow123d
Merge branch '1.8.0_master'

Conflicts:
	CMakeLists.txt
Remove compiler warnings.

- remove warnings generated by -Wsign-compare flag.
Remove compiler warnings.

-remove warnings generated by -Wunused-function and
-Wmaybe-uninitialized flags
Remove compiler warnings.

- remove unused variables (warning -Wunused-variable)
Remove compiler warnings.

- remove warning -Wparentheses
Merge branch 'master' into DF_warnings
Remove compiler warnings.

- remove warning -Wreorder
Optimization of LinSys::get_matrix method.

- remove -Wreturn-type warning
Optimization of LinySys::get_rhs method.

-remove -Wreturn-type warning
Remove compiler warnings.

- remove warning -Wreturn-type
Remove compiler warnings.

- remove warning -Wunused-but-set-variable.
Fix of error.
Remove compiler warnings.

- remove warnings -Wsign-compare and -Wunused-variable.
Remove compiler warning.

- remove warning 'function used but never defined'