v1.40.1

This is a bugfix release of seqmonk which adds some optimisations to the
background data model and fixes a number of bugs.

• Changed the internal data model to store positions and counts separately
  to make the storage of heavily duplicated data much more efficient

• Added a LIMMA statistical filter

• Modified the GTF parser to better deal with the structure of Ensembl
  GTF files.

• Changed all of the launchers so you can pass a file name to open. Allows
  file extensions to be associated with seqmonk so you can open projects
  by double clicking on them.

• Improve the merging of transcripts in the RNA-Seq pipeline to use
  gene ids where they are present in the annotation so we don't get
  spurious merging of overlapping transcripts on the same strand which
  are annotated as belonging to different genes.

• Updated the genome processing scripts so that gene_ids are added to
  all transcripts

• Fixed a crash in the aligned probes plot when no data stores are visible

• Fixed a display bug for the list of features in the feature filter and
  quantitation trend plot.

• Fixed an inefficient packing algorithm when the number of reads was too
  great to be displayed within the available height of the chromosome view.