T-Rex 0.18.6

• (ethash, kawpow, progpow) Reduce GPU memory consumption (by ~6MB)
• Cache DAG for epoch 0 when mining ETH+ZIL (run with --extra-dag-epoch 0 parameter)

Bug fixes:

• (ethash) kernels 4 and 5 generate incorrect shares if DAG size > 4GB (e.g. when mining ETC)
• (ethash) out of memory error in "zombie" mode
• worker parameter is ignored if placed under pools section in a config file
• Various web UI fixes
• The miner now reports hashrate every 2 seconds in benchmark mode