Conflicts:
	pyfstat/core.py

writer function for atoms (TransientGridSearch)

See merge request GregAshton/PyFstat!14

Closes #12

displayless matplotlib import workaround also in helper_functions.py

See merge request GregAshton/PyFstat!12

transients: fix window=none case and allow custom dt0, dtau

See merge request GregAshton/PyFstat!11

This updates get_input_data_array. First, the list of possible search
parameters is defined as a list of strings in the class itself avoiding
repeated definitions of get_input_data_array. Second, is `args.clean == True`
then the input_data is not generated as an array, but a generator. For
large arrays this avoids memory issues.

 -first search should be standard non-transient GridSearch for comparison

Create TransientGridSearch to provide transient grid searches

Closes #11

See merge request GregAshton/PyFstat!10

Previously, this functionality was part of GridSearch, this splits this
into a separate subclass to ease future development.

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 !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