-kog, -kf and LV2 testing needed

Hi,

quite a bit of activity in the git master again, so time to upload
a snapshot tarball again.

Tarball
-------

The snapshot tarball is at (matching git HEAD 
323e08bfa80246a372be31512022591d1f38c696):
http://ecasound.seul.org/download/snapshots/ecasound-2.8.1+dev-20120429.tar.gz

Feedback needed on
------------------

I'd welcome feedback (read: "ack, nothing odd found" or "stop the press"):

   - -kog and -kf, these have been basicly rewritten (only sane
     way to close the bugs there were)

   - new configure checks for liblilv now that 0.14.2 is
     officially out
 	-> LV2 support should be enabled by default if you
 	   have sufficiently new liblilv installed (newer
 	   than 0.5.0)

   - in general, more stress-testing for the LV2 support

Example test sequences
----------------------

Some samples to test (using alsa as outpu here, replace with JACK or a 
file, ..). All of these use the same params for swh-plugins 'analogueOsc', 
which is available both as a LADSPA and a LV2 plugin (so you can test with 
both). The syntax for '-kog' is pretty scary (and there was an ancient doc 
bug in ecasound(1) man page concerning it), so I'm fairly so very, very 
few people have ever used these).

# 0.2Hz -kog with linear envelope (LADSPA + LV2)
ecasound -i:null -o:alsa -el:analogueOsc,3,400,0.4,0.05 -kog:2,20,1000,0.2,1,1,0,0,0.5,1.0
ecasound -i:null -o:alsa -elv2:http://plugin.org.uk/swh-plugins/analogueOsc,3,400,0.4,0.05 -kog:2,20,1000,0.2,1,1,0,0,0.5,1.0

# 0.2Hz -kog with step/hold envelope
ecasound -i:null -o:alsa -el:analogueOsc,3,400,0.4,0.05 -kog:2,20,1000,0.2,0,1,0,0,0.5,1.0

# 0.5Hz -kos with more envelope points
ecasound -i:null -o:alsa -el:analogueOsc,3,400,0.4,0.05 -kog:2,20,1000,0.2,1,5,0,0,0.1,1,0.2,0,0.3,1,0.4,0,0.5,1

# 0.2Hz -kf with linear envelope (preset 0)
ecasound -i:null -o:alsa -el:analogueOsc,3,400,0.4,0.05 -kf:2,20,1000,0.2,1,0
# same with preset 2
ecasound -i:null -o:alsa -el:analogueOsc,3,400,0.4,0.05 -kf:2,20,1000,0.2,1,2

# 0.2Hz -kog with step/hold envelope (presets 0 + 2)
ecasound -i:null -o:alsa -el:analogueOsc,3,400,0.4,0.05 -kf:2,20,1000,0.2,0,0
ecasound -i:null -o:alsa -el:analogueOsc,3,400,0.4,0.05 -kf:2,20,1000,0.2,0,2

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