- Method aliases clean-up.

1. Removed the camelCase method aliases. All methods will now follow the underscore-separator philosophy.
2. Changed the behavior of some methods.
3. Merged similar methods together.

- The most important changes are the following:

* Regex.matches() is available only as Regex.match()
* Array<<() and Array>>() no longer shift the array;
    * Array<<()  ==  Array.push()
    * Array>>()  ==  Array.assign_to()
* Array.assign_to() now removes the elements from the array.
* Added the Array.remove_last(obj) method to remove that last object from the array
* Ref.\() can now take a reference to Magic variables, like "$?", "$/", etc...

lib/Sidef/Convert/Convert.pm

@@ -13,23 +13,19 @@ package Sidef::Convert::Convert {
           : $self;
     }
 
-    *to_str    = \&to_s;
-    *to_string = \&to_s;
+    *to_str = \&to_s;
 
     sub to_obj {
         my ($self, $obj) = @_;
         return $self if ref($self) eq ref($obj);
         $obj->new($self);
     }
 
-    *to_object = \&to_obj;
-
     sub to_i {
         Sidef::Types::Number::Number->new_int($_[0]->get_value);
     }
 
-    *to_integer = \&to_i;
-    *to_int     = \&to_i;
+    *to_int = \&to_i;
 
     sub to_rat {
         Sidef::Types::Number::Number->new_rat($_[0]->get_value);

lib/Sidef/Math/Math.pm

@@ -229,8 +229,6 @@ package Sidef::Math::Math {
         Sidef::Types::Number::Number->new(($from + $to) * (($to - $from) / $step + 1) / 2);
     }
 
-    *rangeSum = \&range_sum;
-
     sub map {
         my ($self, $value, $in_min, $in_max, $out_min, $out_max) = @_;
 

lib/Sidef/Math/Math.pod

@@ -572,18 +572,11 @@ Return the
 
 =cut
 
-=head2 rangeSum
+=head2 range_sum
 
-Math.rangeSum(I<from>, I<to>, I<step>) -> I<Num>
+Math.range_sum() -> I<Obj>
 
-Returns the sum for a given range of numbers and an optional step.
-
-    Math.rangeSum(1, 9);     # returns: 45 (1+2+3+...+9)
-    Math.rangeSum(1, 9, 2);  # returns: 25 (1+3+5+...+9)
-
-Aliases: I<range_sum()>.
-
-Returns an object of type: C<Sidef::Types::Number::Number>
+Return the
 
 =cut
 

lib/Sidef/Sys/Sys.pm

@@ -41,8 +41,6 @@ package Sidef::Sys::Sys {
         Sidef::Types::Bool::Bool->new(Time::HiRes::nanosleep($sec->get_value));
     }
 
-    *nanoSleep = \&nanosleep;
-
     sub usleep {
         my ($self, $sec) = @_;
 
@@ -55,8 +53,6 @@ package Sidef::Sys::Sys {
         Sidef::Types::String::String->new($^O);
     }
 
-    *osName = \&osname;
-
     sub user {
         my ($self) = @_;
         Sidef::Types::String::String->new(CORE::getlogin);

lib/Sidef/Sys/Sys.pod

@@ -285,8 +285,6 @@ Sys.nanosleep() -> I<Obj>
 
 Return the
 
-Aliases: I<nanoSleep>
-
 =cut
 
 =head2 open
@@ -305,18 +303,11 @@ Return the
 
 =cut
 
-=head2 osName
-
-Sys.osName() -> I<String>
-
-Return the name of the current operating system under which Sidef is running.
+=head2 osname
 
-    Sys.osName    # 'linux'   under Linux
-                  # 'MSWin32' under Windows
+Sys.osname() -> I<Obj>
 
-Aliases: I<osname()>.
-
-Returns an object of type: C<Sidef::Types::String::String>
+Return the
 
 =cut
 

lib/Sidef/Time/Gmtime.pm

@@ -36,11 +36,8 @@ package Sidef::Time::Gmtime {
         *minute    = \&min;
         *second    = \&sec;
         *month_day = \&mday;
-        *monthDay  = \&mday;
         *week_day  = \&wday;
-        *weekDay   = \&wday;
         *year_day  = \&yday;
-        *yearDay   = \&yday;
     }
 
     sub ctime {

lib/Sidef/Time/Localtime.pm

@@ -36,11 +36,8 @@ package Sidef::Time::Localtime {
         *minute    = \&min;
         *second    = \&sec;
         *month_day = \&mday;
-        *monthDay  = \&mday;
         *week_day  = \&wday;
-        *weekDay   = \&wday;
         *year_day  = \&yday;
-        *yearDay   = \&yday;
     }
 
     sub ctime {