Conflicts:

	ChangeLog
	doc/manual.html

This allows to return the string 0 if a regular expression is
not found. This is probably useful for storing numerical values into
database columns.

abd link to new online regex generator tool added

- added message property "inputname", which contains the name of the
  input (module) that generated it. Presence is depending on suport in
  each input module (else it is blank).
- added system property "$myhostname", which contains the name of the
  local host as it knows itself.

(see previous commit)

Conflicts:

	doc/property_replacer.html
	tools/syslogd.c

- added a new property replacer option "sp-if-no-1st-sp" to cover
  a problem with RFC 3164 based interpreation of tag separation. While
  it is a generic approach, it fixes a format problem introduced in
  3.18.0, where kernel messages no longer had a space after the tag.
  This is done by a modifcation of the default templates.
  Please note that this may affect some messages where there intentionally
  is no space between the tag and the first character of the message
  content. If so, this needs to be worked around via a specific
  template. However, we consider this scenario to be quite remote and,
  even if it exists, it is not expected that it will actually cause
  problems with log parsers (instead, we assume the new default template
  behaviour may fix previous problems with log parsers due to the
  missing space).
- doc bugfix: property replacer options secpath-replace and
  secpath-drop were not documented

enables to query just the subsecond part of a high-precision timestamp

implemented in property replacer: if a regular expression does not match,
it can now either return "**NO MATCH** (default, as before), a blank
property or the full original property text