Project admin roles

The following assumes a "librarian" who copies files from e.g. Dropbox to the BOINC server. This reduces the number of roles with server login access.

role	access rights	hrs/week (est.)
librarian	isaac login	1
client release management	github write, isaac login	4
make Win installers	code-sign key	2
make Mac installers		2
make Android packages		2
make Linux installers		2
track dependent libraries		1
manage Alpha testing	isaac login	4
maintain wrappers		2
maintain server VMs		1
maintain translation	github write	1
server software management		1
BOINC server admin	isaac root login	1
maintain project list	isaac login	< 1
maintain BOINC web site	isaac login	< 1