Minor: print info if using sparse M
DOC: add pass band filter source file.
PZ refinements.
Add support for PZ.
BUGFIX: cmin fix.
Check for Nan/Inf/null and sort singularities.
Fix import copy.
TEST: remove VT.
Add support for testing of PZ analyses
DOC: add PZ.
Minor: add spaces to error message.
MINOR: consistent verbosity
DOC: fix header
Merge branch 'master' of https://github.com/ahkab/ahkab into tests
DOC: add PZ.
DOC: add PZ.
DOC: Add PZ.