fileOut FileServer.st

This moves around some of the methods.
Add --fallback-page switch for issue #417

Run like this:
./bin/server --fallback-page index.html
All 404 pages will be 200 using index.html instead.
Recompile server
Merge pull request #447 from jeromebaum/issue-417

Add --fallback-page switch (fixes #417)
FileServer: move >>checkDirectoryLayout into >>start
FileServer: rewrite handling of commandline parameters

All methods in the 'accessing' protocol taking one
parameter are directly turned into a commandline
by adding trailing '--' and removing the ending ':'
This does not require the registration of blocks in
a dictionary any more.
FileServer: add --help commandline option
update API-CHANGES.txt
Merge pull request #466 from mkroehnert/server

Update handling of comandline options; add --help option
FileServer: commandline option for setting listening host (default: 127.0.0.1)
FileServer: transform selector fallbackPage: into --fallback-page and vice versa as suggested by @herby
TestCase: use #printString instead of asString in #assert:equals:

This ensures that the string gets enclosed in '' upon failure.
Previously the start and end of a string was not distinguishable
in the error message.
Merge pull request #468 from mkroehnert/unittest

TestCase: use #printString instead of #asString in #assert:equals:
Merge pull request #467 from mkroehnert/server

Add --host switch to FileServer and change naming of commandline options
Use addJSToLoad everywhere.

There were direct calls to writeScriptTag for jQuery.
Merge pull request #469 from herby/no-direct-writescripttag-calls

Use addJSToLoad everywhere.
Helios-Exceptions package
helios: css tweaks
Helios: HLSourceCodeSaved announcement
Helios: Handle unsaved change