On systems without an i2psvc group, the postinstall would fail. This change
will add the group if it doesn't exist. Also adding "||true" to the usermod
command in case the command returns a non-zero status.

Before there was a patch to add the -deb1 to the RouterVersion.java file, but
it needed me to update the deb#. With my newly budding regex skills, I'm now manipulating
it using sed and determining the number according to the debian version number.

PN,Pitcairn Islands added; we already had the flag.

With this check-in I'm adding the EXTRAVERSION to our javadocs and the custom
installer targets (if EXTRAVERSION is set in RouterVersion.java). Also,
i2pinstall*jar and i2pinstall.bz2 will be removed when ant clean is run.

Flag courtesy of the Open Clip Art Library, released into the public domain

  Compiled on trimslice:
    gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) 
    java version "1.6.0_18"
    OpenJDK Runtime Environment (IcedTea6 1.8.10) (6b18-1.8.10-0ubuntu1~11.04.1)
    OpenJDK Zero VM (build 14.0-b16, mixed mode)
    Wrapper 3.5.13 GPLv2
    All binaries stripped.

All of the present jbigi libs are linked against 4.3.x and 5.0.2.

I removed Tanuki's broken CPU "bitness" check for OSX in
3db46be1ede7d858b6c319905cf310d99227eb29. With this commit I add one that
works. Note that at this point we don't use the "bitness" checking because we
ship a quad-fat wrapper for OSX. Unfortunately, one can only manipulate the osx
binaries with "lipo" which is only available in OSX. In the future we may want
to use the "bitness" logic.

In any case, the old check set the bits to 64 for Leopard and above, but just
because a Mac is running Leopard or Snow Leopard doesn't mean it's 64bit
capable. This addition of mine will actually check the flags using sysctl. I'm
not using uname because OSX < Lion starts in 32bit mode by default (but can
still run 64bit binaries).

     and '554846d3fd4ebcdbfaccb3a001098626e0b26ca0'

    thx "ajutine" - public domain

   - move router.ping to /var/run/i2p
   - move temp files to /var/tmp/i2p
   - Since gaps are allowed in the numbering with newer wrapper versions, start
     *.adddional.# numbering at 10
   - redirect errors to stderr