Fix wrapping and indentation for PowerShell scripts

ftplugin/ps1.vim

@@ -12,9 +12,14 @@ if exists("b:did_ftplugin") | finish | endif
 " Don't load another plug-in for this buffer
 let b:did_ftplugin = 1
 
-setlocal tw=0
+setlocal tw=79
 setlocal commentstring=#%s
 setlocal formatoptions=tcqro
+setlocal tabstop=4
+setlocal softtabstop=4
+setlocal shiftwidth=4
+setlocal expandtab
+setlocal autoindent
 
 " Change the browse dialog on Win32 to show mainly PowerShell-related files
 if has("gui_win32")