In roughly descending order of significance:
- Enable READLINE OPTION by default
 - Install LDIF and schema files if LDAP is enabled
 - Add READLINE_PORT OPTION to use devel/readline port
 - Respect DOCS and EXAMPLES global OPTIONS
 - Use PORTDOCS and PORTEXAMPLES
 - Describe CMD_LINE_EDITING group
 - Adopt OPTION helper macros
 - Pet portlint (trim newline, tighten CONFLICTS, NLS option for gettext, regenerate patches)
 - A few other minor simplifications to reduce repetition and improve robustness and readability