pass ax and show_legend in arg of plotting functions
CHG: reverted calibration2 apply to old syntax to avoid many problems
CHG: working on calibration2 tests
FIX: added handling of carrage return to rean_pna_csv
ADD: added a shorthand way to window and plot s_time_db, although
	its not very intuitive or clear its easy to use, plot_s_db_time
ADD: complex time component to all Network properties
ADD: overlapp function for frequency
ADD: Frequency.overlap, and overlap_freq  to calculate the
	overlapping frequency of two frequencies.
ADD: Network.overlap : implements the overlap for a pair of  Networks
ADD: doc links in TOC's to overlap funcs
ADD: agilent csv class,  because the number of methods needed
	was getting too large
ADD: find b12, first step towards trl
ADD: deprecation warnings
ADD: find_correct_root function
rewritten dict creation in order to maintain python 2.6 compatibility

Python 2.6 has not implemented comprehensive dict creation yet (cf. Pep
274). In order to run skrf in python 2.6 all compehensive dict creations
have been rewritten with dict creation of comprehensive lists.
Merge branch 'develop' of github.com:hohe/scikit-rf into develop
CHG: working on TRL
ADD: AgilentCSV test case.  other minor fixes to testsuite
Merge pull request #12 from hohe/develop

Maintain Python 2.6 compability
ADD: added a HUGE improvement to util.ObjectDict which will
	make most of NetworkSet obselete.
ADD: some more materials properties
ADD: Network.crop function to crop frequency range without interpolate
ADD: added and changed the Homogenous collections in util.
ADD: added and changed the Homogenous collections in util.
Merge branch 'develop' of github.com:scikit-rf/scikit-rf into develop

Conflicts:
	skrf/util.py
Merge pull request #13 from edy555/fix-show-legend

add missing args of ax and show_legend for plotting functions