The patch removes the "files" section from package.json to avoid future issues
with missing files.  For package testing purposes, 'npm pack' is used instead
of plain 'tar' to simulate packaging more accurately.

This makes the "sed" instruction simpler and more portable, as the previous
variant didn't work well on BSD systems due to the "\s" metacharacter.

Thanks to Sergey A. Osokin <osa@FreeBSD.org.ru> for spotting this issue.

Also, this should prevent accidentally creating a version 1.0.0 package.

Globally installed modules require a globally installed libunit.
The "binding_pub.gyp" file is the correct version, otherwise linked module
may have unresolved symbols because libunit is not linked.

While it looks nicer without zero 3-rd version number, this should
improve interoperability.  Version string can be parsed or used for
sorting.  And it is easier to handle and less confusing when there
is constant number of version parts.

Moreover, NPM also expects version format with 3 parts.
So ".0" has already been used in Node.js module version.

This also eliminates expressions that incompatible with BSD make, thus fixing
installation of Node.js module on FreeBSD (broken by dace60fc4926).

By default "npm install" switches to non-privileged user to run package scripts
if it is invoked by root.  As a result it may prevent node-gyp from writing to
package directory and break installation of the module.

To disable this switching the --unsafe-perm flag is added.

Now by default "make install" installs the module globally.
The "--local" configure option added for local installation.