v0.17.1.1

• bump requirements: libCSS to 0.9.2 and libdom to 0.4.2
• revert "[head] addcrlf". #281
• main, article and nav elements #282
• bashism in configure.ac #285
• eliminate GNUism in sed #305
• python module imp is deprecated #313
• fix hooks.py detection #333
• cast to unsigned char * in inpfield #315
• fix suspend in session master when fork_on_start #296
• remove 300ms startup delay and optimize fork_on_start #297
• missing <sys/cdefs.h> on systems with musl libc #306