Additions and improvements to the FDSTools library file format:
* New [genome_position] section in FDSTools-style library files allows
for specifying the chromosome and position of each marker.
* New [no_repeat] section in FDSTools-style library files allows for
including non-STR markers.
* Comma/semicolon/space-separated values in FDSTools-style library files
can now also be separated by tab characters and multiple consecutive
separators are no longer collapsed (with the exception of whitespace).
* If no prefix and/or suffix has been specified for an alias, the
prefix/suffix of the marker itself is used.
* Implemented support for non-STR markers (e.g. SNP clusters) and mtDNA
markers. Allele names of the latter follow mtDNA nomenclature.
* Improved the logic of generating STR allele names for sequences that
have a prefix or suffix sequence that was not included in the library
file.
* Updated and clarified various explanatory texts in generated FDSTools
library files.

Fixed:
* Fixed a bug that caused prefix/suffix variants in aliases to go
missing in allele names.

Improved file handling:
* Library files are now closed immediately after parsing them.
* Sample data input files are opened one at a time now.

Visualisations:
* Updated Vega to version 2.3.1.
* Worked around a bug in Google Chrome that caused the 'Save image' link
to stop working after having been used once.

* Added StuttermodelVis HTML file and JSON spec. The rendering
  works, but some of the options are not implemented yet. It is
  also not yet added to the Vis tool.
* Changed the order of stuttermodel's coefficients: 'a' used to be
  the most significant coefficient, now it is the least significant
  coefficient (the shift). The benefit of this is that when moving
  to higher-order polynomials, the extra coefficients do not change
  the meaning of the others. So 'a' is now always the shift, 'b' is
  the linear component, 'c' the quadratic, etc.
* Added some development notes (including todo list) that I had
  kept outside of the project until now.

* BGCorrect and Stuttermark will now exit with an error message if
  more than one input file for the same sample is specified and no
  separate output files are given. Previously these tools would
  just overwrite the output file repeatedly, discarding the output
  of all but the last data file of the sample.
* Removed to main() functions and related stubs from the tools
  because they are not actually runnable directly anyway.
* Added some more help text to some of the tools.
* Doubled the size of the marker name filter input element on the
  HTML visualisations.

* New tool BGMerge can be used to merge background noise profiles
  (e.g., merge BGPredict output with a database previously
  obtained from BGEstimate).
* Fixed two major bugs in BGPredict that resulted in incorrect fit
  functions being used.
* BGEstimate, BGPredict, BGHomStats, Blame, and StutterModel no
  longer crash if a library file is specified.
* Added reverse strand profile estimation to BGPredict.

* New tool BGPredict predicts background noise profiles (containing
  only stutter products) for user-supplied alleles/sequences using
  a trained stutter model obtained from Stuttermodel. Currently
  only the amounts of the forward strand are predicted.
* New option -L/--min-lengths for Stuttermodel allows to set a
  minimum required number of unique repeat lengths to base the
  fits on (default: 5).
* Updated formatting of output of Stuttermodel: added '+' sign to
  positive stutter, limited r2 scores to 3 decimal places, and now
  all coefficients are written in scientific notation with 3
  decimal places.
* The --output-column option of SeqConvert now defaults to using
  the value of --allele-column.