Complete user docs.

docs/user/system_requirements.rst

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+.. highlight:: perl
+
+
+*******************
+SYSTEM REQUIREMENTS
+*******************
+
+
+Most tools require:
+
+
+\* Perl v5.8 or newer
+
+
+
+\* Bash v3 or newer
+
+
+
+\* Core Perl modules like Time::HiRes
+
+
+
+Tools that connect to MySQL require:
+
+
+\* Perl modules DBI and DBD::mysql
+
+
+
+\* MySQL 5.0 or newer
+
+
+
+Percona Toolkit is only tested on UNIX systems, primarily Debian and
+Red Hat derivatives; other operating systems are not supported.
+
+Tools that connect to MySQL may work with MySQL v4.1, but this is not
+test or supported.
+