Make indentation uniform across source files.

This patch replaces tabs with spaces and sets indentation to 4 across
all source files. Previously there was a mix between spaces and tabs
between files and sometimes within a file as well as different
indentation widths.

It's regrettable that such a git-history intrusive commit is required.

src/argv.cpp

@@ -8,15 +8,15 @@
 
 namespace procman
 {
-  OptionGroup::OptionGroup()
-    : Glib::OptionGroup("", ""),
-      show_system_tab(false)
-  {
-    Glib::OptionEntry sys_tab;
-    sys_tab.set_long_name("show-system-tab");
-    sys_tab.set_short_name('s');
-    sys_tab.set_description(_("Show the System tab"));
-    this->add_entry(sys_tab, this->show_system_tab);
-  }
+    OptionGroup::OptionGroup()
+        : Glib::OptionGroup("", ""),
+          show_system_tab(false)
+    {
+        Glib::OptionEntry sys_tab;
+        sys_tab.set_long_name("show-system-tab");
+        sys_tab.set_short_name('s');
+        sys_tab.set_description(_("Show the System tab"));
+        this->add_entry(sys_tab, this->show_system_tab);
+    }
 }
 

src/argv.h

@@ -5,14 +5,14 @@
 
 namespace procman
 {
-  class OptionGroup
-    : public Glib::OptionGroup
-  {
-  public:
-    OptionGroup();
+    class OptionGroup
+        : public Glib::OptionGroup
+    {
+      public:
+        OptionGroup();
 
-    bool show_system_tab;
-  };
+        bool show_system_tab;
+    };
 }
 
 #endif // H_PROCMAN_ARGV_1205873424