Log Message:

Update to version 0.7.0

  No CFLAGS+=-DHAVE_XXXX=0 anymore, if XXX is not found
  it is not defined at all. autoconf works the same way.

  mkc_check_xxx scripts:
      - installed to bin/ directory just like normal scripts.

      - if MKC_VERBOSE variable is equal to '1', verbose messages
        are output to stderr.

      - -h|--help options printing usage information.

      - manual pages are created.

  new variable MKC_NOCACHE, if it is set to 1, caching is disabled.

  fix in mkc_check_decl: long-long is treated as 'long long'.

  MKC_SHOW_CACHED, MKC_VERBOSE, MKC_DELETE_TMPFILES, MKC_NOCACHE
  variables: 1 - true, other values - false.

  minor clean-ups in Makefile