- Update to final readline-8.1
which is mainly rc3
- Remove obsolate patches and the signatures
* readline80-001
* readline80-001.sig
* readline80-002
* readline80-002.sig
* readline80-003
* readline80-003.sig
* readline80-004
* readline80-004.sig
- Port patches
* readline-5.2-conf.patch
* readline-6.2-metamode.patch
* readline-6.3-destdir.patch
* readline-6.3-input.dif
* readline-6.3-rltrace.patch
* readline-7.0-screen.patch
- Port and rename patch readline-8.0.dif which is now readline-8.1.dif

- Update to readline-8.1-rc3 for testing
* Fixed a bug that could cause point to be set beyond the end of the line
buffer when aborting an incremental search.

- Update to readline-8.1-rc2 for testing
* Bracketed paste mode is enabled by default. There is a configure-time
option (--enable-bracketed-paste-default) to set the default to on or off.
* Terminals that are named "dumb" or unknown do not enable bracketed paste
by default.
* Ensure that disabling bracketed paste turns off highlighting the incremental