don't use primary for "a" css styling

[Rogan Hamby]

There are a number of things that could be done to make the CSS more customization friendly in Evergreen but this is the one I run into most often and that is the "a" element in var/templates/opac/css/style.ccs.tt2 (~ line 37) uses css_colors.primary

This causes issues when the the primary colors for the header and footer are set to the same color as the center background and you then end up with the same color on the same background and this effects trickles into links throughout the opac.

For a partial fix I'm thinking of adding an entry to templates/opac/parts/css/colors.tt2 for a_links with a default value of "#ffffff" to match stock but then make it easily customizable.

[Shula Link (slink-g)]

Fix based on Roger's idea pushed here:

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/slink/lp1736967_primary_a_css_fix

Since the Angular 2 update seems to pull css from the bootstrap-css-only package, I'm not sure if there's a need for an implementation there.

[Rogan Hamby (rogan-hamby)]

sign off pushed to user/rogan/lp1736967_signoff

[Galen Charlton (gmc)]

Pushed to master, along with a follow-up that adds release notes. Thanks, Sam and Rogan!