Ignore temporary files.
Add NEWS file.
Provide more info when a node is not found.
Bugfix
Fix subcircuit instances parsing.

In subcircuit instances, the <subnode>=<circuit node> string has to be split
in <string>=<string>, always. Not <string>=<float>, even if float(circuit node)
gives no error.
Prettier plotting. White marker face and breathing space on the y axis.
Rearrange directory structure.
Ring3 nose test.
R2R ladder nose test
Colpitts oscillator nose test
Initial commit
Merge branch 'master' of https://github.com/ahkab/ahkab into refactor
Initial commit