mod_admin_web: Better error reporting

mod_admin_web: Default the host selection to the administrators domainpart

mod_incidents_handling: commiting its auxiliary library.

mod_incidents_handling: recommit after full test, cleaned it a bit as what I posted was regretfully an unfinished draft, replaced a lot of the fixed type fields used for fields description with desc elements (upstream prosody's util.dataforms will still strip those). Also moved auxiliary functions to a library.

mod_incidents_handling: still needs some work to be actually functional, backing it out until it's ready.

mod_websocket: Avoid floating point division The problem here was that Lua's integer conversion (rounding?) routines behave differently on x86 vs. x86_64 (and even on those there can be minor differenes). Usually the former does proper rounding, while the later floors.

mod_websocket: Change the HTTP name to websocket, and override the default_path instead

mod_smacks: Don't try to send stanzas to hibernating sessions. Fixes duplicate IQ replies on libevent.

mod_incidents_handling: fix typo on function name.

mod_incidents_handling: initial commit, only about half tested, util functions (parsers, etc) should be working and so do adhoc commands. All the fixed-type fields into the adhoc cmds' output are currently stripped by Prosody until someone *fills* line 56 of util.dataforms.