- Use explicit file modes when installing binaries & scripts (not essential,
  but someone complained about it).

- Use $(INSTALL_SCRIPT) for scripts

Move 4.01 onto the main trunk.

- remove *.hc from MOSTLY_CLEAN_FILES.

Remove old literate documentation support, and add support for
multi-file SGML documents.

Added TAGS_HS_SRCS and TAGS_C_SRCS

Added *.hc to list-of-files-to-remove-when-cleaning

Include BOOT_SRCS with default for HS_SRCS

Removed unused (old) INSTALL setup & added INSTALL_SCRIPT

Added DOC_INFO variable

make depend defaults srcs defined

look for readline.h, BOOT_SRCS fix, HAPPY default setting

Major update to more-or-less 2.02