Added additional function to use predefined exons for primer design
without using Alternative Splicing Modules (biconnected components).
This prevents users from making bad choices of exons and then seeing
bad lookin plots or failed primer designs.
Replace usage of save_path_info function from a method within exon_seek
to a function in the utils.py module
Fixed several issues related to user specified flanking exons. Including
saving as HTML, filtering based on weakly connected graphs, and ensuring
the paths/counts get saved as a json file.
Should now handle user defined exons by using only txs that have exactly
the same exons.
Increased the size of the listctrl in the save plots dialog
Tried to fix the position of the output choice label in the required
tab