1) Add rcparams to prevent all use of offsets
2) Fixes error when nglitch > 1 in which the summary did not show all
values
3) Fixes error in which the max_twoF used incorrect indexes

Also various improvements to logging commands

1) Use calculate_thetas to precalculate all thetas and then iterate
through to calculate twoF values. This will be important when we want to
allow theta to run both from and two theta0
2) Add diagnostic information on the mean acceptance fraction

1) Adds option to force the use of cached data
2) Orders the output .par files
3) Adds maxtwoF to output par files

Gives a more general fully-coherent grid search along with the
specialised grid glitch search

- Also adds examples to readme
- Fixes useOffset when ndim>1

Note: this also adds a check for transient, if not called, then the
whole data is searched. This does not however mean only transient, but
also glitch like searches which use the transient tools.

Additionally fixes the plot_walkers command to allow it to plot walkers
when ndim =1 and to switch off the use of offsets

This makes the MCMCGlitchSearch a subclass of the more general
MCMCSearch

1) Fixes grid search and adds example
2) Automates min/max Cover Freq to simplify input

Create a separate class for pure ComputeFstat wrapper, then gives this
as a parent to the other searches. Ultimately, this will allow the use
of the ComputeFstat class without needing the glitch part, for example
for a transient search.

Removes the fully-coherent search which was just a wrapper to CFS_v2 and
all of the `slow' methods which used command line arguments rather than
the python interface.