Added expression syntax description to documentation.
Use bulleted lists.
Split bundles of reported signals or connections into multiples of 20 messages to prevent bundle from growing too large.
Add instance-related functions to Windows DLL exports.
Add msig_set_instance_management_callback() to DLL export list.
Renamed MAPPER_TIMETAG_NOW to MAPPER_NOW; also redefined it internally as {0L,1L} to avoid accidental usage - this does not imply anything about immediate dispatch however, since there is no concept of TT_IMMEDIATE in libmapper and all bundles will have real timetags.
Merge remote-tracking branch 'steve/master'
Revision of instance release/release_request logic: devices must pass release messages downstream regardless of whether they are the originating device/instance owner. Release request messages will only be used when sending to instance originator.
If input signal is released locally, send release request upstream but do not release instance.
Merge branch 'master' into metronome

Conflicts:
	include/mapper/mapper_db.h
	src/router.c