follow 6.x-1.5

5428e9f #676200: Repair block caching so contextual links only display for appropriate users.
1e188b3 Backporting D7 API and Schema to D6 Branch.
9e68640 Add feed.png icon.
801e7ad Do some checks to make sure that a D5 upgrade doesn't go through all the update fncs.
220449f #798384: Allow for custom tooltips.
90e7893 #798428: Allow for custom regex validation.
3fe7424 Add a Newsletter network and icon.
6315190 #623198 by heather: Add a RSS feed icon.
a3d9bf0 #825474 by AlexisWilke: Fixed follow_link_title() needs to extract from .
3618d59 #826034 by glen201: Fixed HTML showing in User block follow links.
c4373fc #825484 by AlexisWilke | q0rban: Fixed unserialize() errors after update to 1.x-dev version.
2d8e943 Stripping CVS keywords
646e96f Updating README.txt with CSS examples.
b9d4334 Expose the site follow links as a variable to the page template.
eff87c4 #1142984: Set the default uid to zero in follow_networks_load().