Merge and cleanup TTEthernet code from Maja

[schoeberl]

There are two merge conflicts that need to be resolved:

both modified:   hardware/config/altde2-all.xml
both modified:   hardware/src/main/scala/io/EthMac.scala

The whole merge adds quite some files:

modified:   c/ethlib/eth_mac_driver.c
modified:   c/ethlib/eth_patmos_io.c
modified:   c/ethlib/eth_patmos_io.h
new file:   c/ethlib/tte.c
new file:   c/ethlib/tte.h
new file:   c/ethlib_tte_demo.c
new file:   c/ethlib_tte_demo_interrupts.c
new file:   c/ethlib_tte_demo_latency.c
new file:   c/ethlib_tte_wcet.c
new file:   hardware/config/altde2-interrupt.xml
new file:   hardware/config/altde2-latency.xml
new file:   hardware/config/default-no-timer.xml
modified:   hardware/ethmac/eth_controller_top.vhdl
new file:   hardware/ethmac/eth_controller_top2.vhdl
new file:   hardware/quartus/altde2-interrupt/patmos.qpf
new file:   hardware/quartus/altde2-interrupt/patmos.qsf
new file:   hardware/quartus/altde2-interrupt/patmos.sdc
new file:   hardware/quartus/altde2-latency/patmos.qpf
new file:   hardware/quartus/altde2-latency/patmos.qsf
new file:   hardware/quartus/altde2-latency/patmos.sdc
new file:   hardware/src/main/scala/io/EthMac2.scala
new file:   hardware/vhdl/patmos_de2-interrupt.vhdl
new file:   hardware/vhdl/patmos_de2-latency.vhdl
new file:   wcet/analyse_wcet.sh
new file:   wcet/config_de2_115.pml

• cleanup should remove unneeded top-level VHDL and configuration files.
• the example application shall be a folder in app and not part of the Ethernet library