Remove redundant _CFLAGS/_LIBADD/_LDADD/PKG_CHECK_MODULES.
Alter calls to make to avoid sending '-j1' argument.
Normalize install script, remove /usr/local pre-install cleanup.
Fix break.
Merge pull request #27 from pmienk/develop

install script normalization
Correct pc file, script error.
Merge pull request #28 from pmienk/develop

Correct pc file, script error.
Merge pull request #29 from libbitcoin/develop

Develop