lib/runscripts/in_datasrc_dir.run: datasrc_make(): use `if remaking ...` instead of accessing $_remake manually, for clarity

bugfix: lib/runscripts/in_datasrc_dir.run: datasrc_make(): use set_make_vars and $_remake as required in lib/sh/make.sh `remaking`

lib/sh/make.sh: remaking alias: documented that you MUST use set_make_vars at the beginning of any function that uses this, so that $_remake is properly set to $remake and not left at its previous value

web/links/index.htm: updated to Firefox bookmarks. git: added instructions to migrate from svn.

web/links/index.htm: updated to Firefox bookmarks. git: added instructions to migrate from svn.

web/links/index.htm: updated to Firefox bookmarks. added instructions for running `svn switch` after moving everything into /trunk/ (for us, use `svn switch --force https://code.nceas.ucsb.edu/code/projects/bien/trunk # runtime: <1 min`).

web/links/index.htm: updated to Firefox bookmarks. added instructions for running `svn switch` after moving everything into /trunk/ (for us, use `svn switch --force https://code.nceas.ucsb.edu/code/projects/bien/trunk # runtime: <1 min`).

/: re-set svn:ignore on new root (/trunk/)

moved everything into /trunk/ to create the standard svn layout, for use with tools that require this (eg. git-svn). IMPORTANT: do NOT do an `svn up`. instead, re-use your working copy's existing files with `svn switch` (http://svnbook.red-bean.com/en/1.6/svn.ref.svn.c.switch.html).

added standard svn dirs branches, tags, trunk