Added -p flag in mkdir in install-db.sh, not sure if it's needed but can't hurt
Add prominent pointer to ot4 in dev resources list
Added SILVA to list of taxonomies; changed GBIF URLs to map to new GBIF portal
Remove extraneous slash in Index Fungorum links
Improve sanity checking on some config setting
Merge pull request #187 from OpenTreeOfLife/jar-misc

A variety of fixes (five commits from JAR)