Previously this returned True regardless of the value of
transientWindowType when really we want to also check if it is not None

- Default to 1 glitch
- Only try to calculate segment 2F if length > 1800s

add transient F(t0,tau) file output

See merge request GregAshton/PyFstat!8

 -"AttributeError: 'function' object has no attribute 'gridcorner'"

 -new output: full (t0,tau) Fstat map,
  if bands in those params are searched
 -one file per Doppler grid point

Closes #7

Closes #9

transients: user-configurable windows, and some minor things

See merge request GregAshton/PyFstat!7

 -replaces boolean 'transient' flag
 -window type [none,rect,exp]
  for both injections and searches
 -t0, tau bands for gridsearch,
  single-point use (e.g. MCMC) should be unchanged

Previously, a check was done to ensure that all initial positions of the
walkers would yield a non -np.inf prior. This extends this to also check
the likelihood evaluations. The method is also simplified partially

Partially resolves issues in #6