Not Autotools 0.6.0

Changes:

• New library files not-ac-messages.m4, not-extended-config.m4 and not-utf8.m4 have been created, containing the following new macros: NC_MSG_ERRORBOX(), NC_MSG_FAILUREBOX(), NC_MSG_NOTICEBOX() and NC_MSG_WARNBOX() (not-ac-messages.m4); NC_CONFIG_SHADOW_DIR(), NC_SHADOW_MAYBE_OUTPUT, NC_THREATEN_BLINDLY and NC_THREATEN_FILES() (not-extended-config.m4); n4_charcode(), n4_codeunit_at(), n4_codepoint_to_ascii(), n4_escape_non_ascii() and n4_escape_everything() (not-utf8.m4);
• New macros n4_let(), n4_qlet() and n4_with() have been created in not-m4sugar.m4
• New macros NS_SETVARS() and NS_UNSET() have been created in not-autoshell.m4
• Macros † NA_REQ_PROGS() and † NA_GET_PROGS() in not-autotools.m4 have been renamed to NC_REQ_PROGS() and NC_GET_PROGS()
• Code review (macros NM_ENVIRONMENT_KEYS and NM_LOAD_ENVIRONMENT in not-automake.m4; macro NM_SET_VERSION_ENVIRONMENT() in not-misc.m4 – the new version of the latter is incompatible with previous versions)
• Documentation