toplev: Updates to README.md
ocperf: Support :amt1 syntax
ocperf: Handle cpu// input events without name
toplev: Support any bit
ocperf: Disable debug print
toplev: Initial support for Toplevel 2.7 with Hyper Threading

Add support for Hyper Threading (SMT) with TopLevel 2.7
This requires running as root or with kernel.perf_paranoid = -1
Currently only for IvyBridge client and server
toplev: Always use detailed model with hyper threading
toplev: Improve root warning
toplev: fix root check
toplev: Add ivb workarounds for lazy evaluation
ocperf: Add workaround for fixed counter cpu_clk_unhalted.thread
ocperf: handle exotic encodings of fixed counters
toplev: Add --raw option
toplev: fix parsing of cpu//
toplev: Avoid zero division
Update README.md