Conflicts fix in debian/control

  * mysql-common should not break 5.1 packages
  * also solves issue #4 with a /usr/bin/mysql file conflict between mysql-client-core-5.5 and mysql-client-5.1

debian/control

@@ -63,7 +63,6 @@ Description: MySQL database development files
 Package: mysql-common
 Architecture: all
 Depends: ${shlibs:Depends}, ${misc:Depends}
-Breaks: mysql-server-5.1 (<< 5.5), mysql-client-5.1 (<< 5.5), mysql-server-core-5.1 (<< 5.5)
 Description: MySQL database common files, e.g. /etc/mysql/my.cnf
  MySQL is a fast, stable and true multi-user, multi-threaded SQL database
  server. SQL (Structured Query Language) is the most popular database query
@@ -76,8 +75,8 @@ Description: MySQL database common files, e.g. /etc/mysql/my.cnf
 Package: mysql-client-core-5.5
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
-Breaks: mysql-client-5.5 (<< ${source:Version})
-Replaces: mysql-client-5.5 (<< ${source:Version})
+Breaks: mysql-client-5.5 (<< ${source:Version}), mysql-client-5.1 (<< 5.5)
+Replaces: mysql-client-5.5 (<< ${source:Version}), mysql-client-5.1 (<< 5.5)
 Description: MySQL database core client binaries
  MySQL is a fast, stable and true multi-user, multi-threaded SQL database
  server. SQL (Structured Query Language) is the most popular database query