Fix a large number of typos and other problems (#110)

Most of these fixes are for typos and extra whitespace at the
end of lines. These are the notable changes:
- Fixed a compatibility issue with how asterisks are displayed
  using certain fonts. Bug report: https://github.com/att/ast/issues/764
- Fixed a bug in the man page that caused searches for the '|'
  character to fail. Bug report: https://github.com/att/ast/issues/871
- Removed a duplicate description of 'set -B' from the man
  page. Bug report: https://github.com/att/ast/issues/789
- Added documentation for options missing from the ksh man
  page (applies to 'hist -N', 'sleep -s', 'whence -q' and
  many of ulimit's options). Bug reports:
  https://github.com/att/ast/issues/948
  https://github.com/att/ast/issues/503#issuecomment-386649715
  https://github.com/att/ast/issues/507#issuecomment-507924608
- Applied the following ksh2020 documentation fixes:
  https://github.com/att/ast/pull/351
  https://github.com/att/ast/pull/352
- Fixed a minor GCC -Wformat warning in procopen.c by changing
  a sentinel to NULL.

src/lib/libast/man/fmtls.3

@@ -51,7 +51,7 @@ formats
 .IR ls (1)
 style file information into the buffer
 .IR buf .
-A pointer to the trailing 0 in 
+A pointer to the trailing 0 in
 .I buf
 is returned.
 .I name
@@ -130,7 +130,7 @@ The user and group fields are each
 .B LS_W_NAME
 characters wide,
 the
-.B LS_INUMBER 
+.B LS_INUMBER
 field is
 .B LS_W_INUMBER
 characters wide,