Add lots of unique tags to error log messages

Use the new APLOG_USE_MODULE/AP_DECLARE_MODULE macros everywhere to take advantage of per-module loglevels

update license header text

Update the copyright year in all .c, .h and .xml files

No functional change: simple detabbing of indented code.

Update copyright year to 2005 and standardize on current copyright owner line.

fix name of The Apache Software Foundation

fix copyright dates and apply the license to one forgotten header file

apply Apache License, Version 2.0

update license to 2004.

finished that boring job: update license to 2003. Happy New Year! ;-))

Update our copyright for this year.

Fix a handful of AP_MODULE_DECLARE_DATA exports for .so modules.

Yet more cleanup.

AP_ function for optional hooks.

More generic -> optional cleanup.

Long overdue name change from "generic hook" to "optional hook".