New ghost point update routines, using Cartesian communicators.
The results are not exactly the same as with the previous version of the subroutines!
To be debugged in the future.
ghostpoint bug fix
Taylor-Couette case modified for comparison with JCP
Bug fixes in the debug mode.
inout for large arrays
temporary arrays when passing non-contiguous parts of arrays
bug fix
Bug fix: runs stopped in adapt_dt - apparently because of segmentation errors during previous runtime_backup
implicit.f90 added
Added implicit 2nd order scheme for the viscous term with centered_4th for the nonlinear term
Guermond-Minev implicit solver implemented
Debug and optimizations of hovering insect case
Free flight implemented, not validated yet
Stroke plane read from ini file
Merge branch 'implicit'

Conflicts:
	src/basic_operators.f90
	src/save_fields.f90