Add RISKS section to Bash tools. Re-order all tools' DOWNLOADING section. Remove some unused options.

bin/pt-align

@@ -66,6 +66,25 @@ Usage: pt-align [FILES]
 pt-align reads lines in files and splits them into words.  This is useful for
 things like aligning the output of vmstat or iostat so it is easier to read.
 
+=head1 RISKS
+
+The following section is included to inform users about the potential risks,
+whether known or unknown, of using this tool.  The two main categories of risks
+are those created by the nature of the tool (e.g. read-only tools vs. read-write
+tools) and those created by bugs.
+
+pt-align is a read-only tool.  It should be very low-risk.
+
+At the time of this release, we know of no bugs that could cause serious harm
+to users.
+
+The authoritative source for updated information is always the online issue
+tracking system.  Issues that affect this tool will be marked as such.  You can
+see a list of such issues at the following URL:
+L<http://www.percona.com/bugs/pt-align>.
+
+See also L<"BUGS"> for more information on filing bugs and getting help.
+
 =head1 DESCRIPTION
 
 pt-align counts how many words each line has, and if there is one number that