Switch to github hosting. Delete dead MASTER_SITES.
One tweak to a dependent (dose) due to a structure change.
Tweaks & ok sthen@ before 6.0 intervened
where needed.
The next step towards Ocaml 4.3.0.
Bulk build by sthen@ identified several laggards which are included here.
ok anil@ sthen@ so final 4.3.0 polishing can be done in-tree.
Because the Aspcud constraint solver is not ported to OpenBSD yet, this
package is configured to use the IRILL online solver by default. To
disable this and use the internal solver, set the "OPAMNOASPCUD" env
variable to "1". You will need to do this if you want to use OPAM
when offline.
ok jca@, tested by krw@ daniel@ jsg@
