Exploit the new sort to perform inplace conversion from IJV to CS[rc] formats

This changes the conversion routines from IJV to CSx formats to use nly an extra workspace of size n+1 and not two full matrices.

mentioned in issue pastix#18 (closed)

added 12 commits

• b5056fde...6395bcdf - 11 commits from branch solverstack:master
• c1be92c7 - Exploit the new sort to perform inplace conversion from IJV to CS[rc] formats

Compare with previous version

closed

reopened

Will be done into another merge request.

closed