doc: moved inet manual from the external repository to INET.
TCP: queue size limitation patch

- By default, the TCP behaviour remains unchanged.
- If queue limit is set by the application using the TCP_C_QUEUE_BYTES_LIMIT
  the TCP model gives an indication to the application when it should generate more data.

This patch is helpful when comparing SCTP and TCP behaviour.
8021d: ISpanningTree was in wrong package. It was not possible to disable the 8021d feature.
build: pre-commit hook script failed when a file was deleted from the repo
build: fixed feature dependencies and the FeatureBuildTest script
build: fixed feature dependencies in NED files.
features: fixed issue when only ethernet was selected. The Ethernet switch was invalid because the L2NetworkConfigurator was missing.
ieee802.11: pass the info up whether the packet had a bit error or a ollision
build: changelog script date updated
doc: manual source moved under dox/src
test: fixed errors because of non-existent result dir
80211: fix wrong return value for freq
doc: whatsnew update
build: fix build error on windows.
test: fix tfingerprint testscript failure on windows
8021d: fix for #754. Added missing INET_API macro.
Ieee80211Frame: added FIXME
SimplifiedRadioFrame: added fixme
backport: IdealWirelessMac: added support for NF_LINK_BREAK
bugfix: NF_LINK_BREAK is a notification on NotificationBoard and not a signal