heirloom vi fixes from arch AUR

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+# The traditional Vi
+This implementation had been derived by Gunnar Ritter
+from ex/vi 3.7 of 6/7/85 and the BSD
+termcap library, originally from the 2.11BSD distribution.
+He had added some useful enhancements,
+most notably UTF-8 support.
+
+The last release of *heirloom-ex-vi* had been
+version 050325 (4.0).
+Until 2007 he added new features, e.g.
+dynamically allocated screen buffers for resizing the terminal
+and support for files with arbitrary line length.
+
+These changes did introduce an issue to numbered lines mode.
+This and other found bugs are fixed now.
+A simple `./configure` had been added to set curses
+as the terminal capabilities access library
+on some systems.
+## How to install
+The embedded termcap library may cause problems on systems where
+there is no `/etc/termcap` and `$TERMCAP` of the user that runs
+`./configure` and other users (e.g. `root`) differs.
+Therefore using termcap has lowest priority during auto-configure.
+To prefere termcap put the corresponding line before the curses
+entries in
+[configure](https://github.com/n-t-roff/heirloom-ex-vi/blob/master/configure).
+```
+$ ./configure
+$ make
+$ su
+# make install
+# exit
+$ make mrproper
+```
+## Usage information
+The traditional `vi` reads the file `~/.exrc` at start-up.
+For full screen scrolling `vi` uses the keys `^F` and `^B`.
+To make <PAGE-DOWN> and <PAGE-UP> work add the following
+lines to `.exrc`:
+```
+map ^[[5~ ^B
+map ^[[6~ ^F
+```