Uropa

- fixed bug in subset_gtf not taking into account comments when subetting gtfs with header

- added '--output-by-query' to allow for output .txt/.bed files per query (split from allhits results). This option can also be given in the config as "output_by_query".
- changed all underscores in input arguments to dashes to conform with standard CLI options. This change is backwards compatible, e.g. --feature_anchor can still be used for --feature-anchor'.

- added functionality to view all available gtf-attributes in output files. Set by show_attributes = all.

- fixed error due to insufficient handling of "chr"-prefix of both bed and gtf

- fixed bug in calculation of 'relative location' occuring for peaks overlapping feature start/end but with anchor=center
- fixed py2 compatibility issues including:
- changed import from "from uropa.utils import *" to "from .utils import *"
- removed 'encoding' keys from read statements
- forced float division

- fixed missing sorting of gtf
- added handling of comment lines in gtf
- fixed insufficient backwards functionality for feature.anchor -> feature_anchor and other keys
- internal speed-up of priority queries by fetching hits from queries separately
- keys such as threads and prefix can now be given via config file
- re-added --summary