More docs added too.

Removed aliby.utils, postprocessor.core/functions and multisignal
and processes.

When processing zarr files with no access to OMERO, OMERO_channels
specifies the correct channels in the correct order, which may
differ from position to position and be incorrect in the meta data,
which is for all positions.

Ensure tps is an int.

metadata functions for finding image sizes moved to image.

Prevent parsing failing on some log files.

For both old and new log files, we now also search the parent directory for
the log file.
For pipeline, OMERO_channels can be specified explicitly.

To ensure INFO logs are printed to the screen.

Data now passed with x and y in the correct order;
References to session removed from BabyParameters