merge of SIP components from EtherGraf's
git@github.com:EtherGraf/ethersex.git sip
dropping doorbell files
help text for SIP_SUPPORT
reformatted source code to comply Ethersex's style guide
no more avrdude rules in common Makefile
finally removed all left-overs
replaced strcpy/strcat with sprintf
fix e6 issue 253 - new script osdefaults.sh to be sourced to get default command for OS
Support for Intertechno Self Learning models in RFM12 ASK

Newer models of the Intertechno remote controlled switches use a
different protocol as default. Now absolute dimmer values can be sent.
Works with arctech based designs from several other vendors.
corrected indents for rfm12 ask
Some changes to RFM12 ASK Intertechno self learning

corrected ecmd_feature
changed command to rfm12 intertechno_sl
added to Configure.help
changed bitorder when sending housecode and device
if dim value is present dim is sent instead of ON.
ECMD was too long
Merge pull request #255 from neffs/master

Support for Intertechno Self Learning models in RFM12 ASK
reformatted using scripts/indent.sh
use prefix 'sip_' for static variables to avoid conflicts with other modules
Merge branch 'EtherGraf/sip'

closes #252

Signed-off-by: Maximilian Güntner <maximilian.guentner@gmail.com>
Merge pull request #254 from michaelb42/e6_osdefaults

fix e6 issue 253 - new script osdefaults.sh to be sourced to get default...
grep/cut not needed if sed is used
Merge branch 'e6_upstream'