Update release notes and documentation for v1.6

[kdahlquist]

Update release notes and documentation for v1.6

[kdahlquist]

Here is some updated language for the Release Notes for v1.6 on the About page.

GRNsight v1.6 includes improvements to the appearance of the gene regulatory network graphs and fixes for several reported issues as follows:

• The arrowhead sizes of the self-referential edges were customized for each edge thickness to improve the appearance of the gene regulatory network graphs. The arrowheads are now centered on the self-referential edges. In Firefox, the pointy end of large self-referential arrowheads are being chopped off. This issue will be fixed in a future release.
• The ability for the server to reject erroneous files without crashing was improved.
• Several bugs related to the Reload and Open functions were fixed.
• The Reload and Print menu options were disabled before a gene regulatory network graph was loaded because there is nothing to reload or print at that point.

[kdahlquist]

I'll not open another issue for this, but we should make the following changes to the Documentation page to go with the release notes above.

For the very last bullet point of section 3, replace what is there with the following:

• To print a graph, select the menu item File > Print. Mac users can utilize native print to PDF function available from their operating system to print the graph to a PDF file. Windows users will need to have the full version of Adobe Acrobat (or other "print to PDF" utility) to print graphs to a PDF file. The Print menu item is disabled until a gene regulatory network graph is loaded. There is a known bug where an extra blank page is printed. This is currently being investigated for a fix in a later release.

For bullet point number 5 in Section 2, replace what is there with the following:

• To reload the same file, select the menu option File > Reload. Note that the Reload menu item will be disabled until a file has been loaded.

[NAnguiano]

The above changes have all been made.

[kdahlquist]

Confirmed changes.