INSTALL updated.
In pfq-couters number of slots set to 131072
Added explicit value of tx_slots and maxlen in open functions/methods
In C library added pfq_open_tx() function
Test regression updated.
Haskell FFI library updated.
Few tests updated.
In pfq-get, added --slots command line option.
2.1.8 released.
Merge branch 'master' into experimental