Commands

- New 'exec' command that runs external programs, implemented by
  CmdExec.
- Restructured code so that only Commands implements ::read_only
  and ::displays_id methods, while derived objects simply set flags.
- Corrected column alignment in summary report.

src/commands/CmdInstall.h

@@ -34,9 +34,8 @@ class CmdInstall : public Command
 {
 public:
   CmdInstall ();
-  ~CmdInstall ();
 
-  bool implements (const std::string&) const;
+  bool implements (const std::string&);
   int execute (const std::string&, std::string&);
 
 private: