Warn on use of long suffix (E1606).

* Per PEP 237, the long suffix is useless in Python2.7+,
  and illegal syntax in Python 3.0+.
Drop long suffixes.
Merge pull request #1141 from Renelvon/no-long-suffix

Strip long suffix from integers.
Added link to image

* Added link to top image to openbazaar site.
* Minor markdown cleanup.
Merge pull request #1144 from Renelvon/add-image-link

Link top image to OpenBazaar site
POSIX-compatible PATH check.
Fix comments and remove extraneous lines.

* Do not parrot commands to stdout.
Factor virtualenv creation.

* Ensure Python 2.7 is used in all installations.
Factor doneMessage.
Update yum packages.

* Remove sqlite and QT dependency.
* Remove implicit dependencies; let yum find and install them.
* Install pyOpenSSL for safety.
* Update bitcoin release to 1.6.
* Do not install bitcoin release if already present. Fixes #967.
* Install ZeroMQ version 3.
* Group dependencies in multiple installations.
Setup a virtualenv on Gentoo.

* Fixes #1132.
Fix LD_LIBRARY_PATH on Fedora.

* Adorn with bitcoin OpenSSL cryptographic libraries. Fixes #990.
Use long form options for all sudo commands.

* Except for sbopkg which does not seem to have long options,
  at least not according to
  https://sbopkg.googlecode.com/svn/trunk/tools/sbopkg8.html