If no version is compatible, mod installation now halts.

If you explicitly have selected an incompatible version, it still lets you.

Should fix #42

CMAN_install.py

@@ -42,6 +42,9 @@ def install_mod(modname, version = None):
 	mod_data = get_mod_from_name(modname)
 
 	if (version == None):
+		if (not is_any_version_compatible(mod_data)):
+			cprint('No version of the mod is compatible!')
+			return
 		version = get_latest_compatible_version(mod_data)
 
 	version_number = 0

CMAN_util.py

@@ -522,7 +522,13 @@ def get_latest_compatible_version(mod):
 	for mod_version in mod.versions:
 		if (mc_version in mod_version['MCVersion']):
 			return mod_version['Version']
-
+
+def is_any_version_compatible(mod):
+	for mod_version in mod.versions:
+		if (mc_version in mod_version['MCVersion']):
+			return True
+	return False
+
 def cinput(terminal_text, gui_text=None, input_type='text', title="CMAN"):
 	print(terminal_text, gui_text, input_type, title)
 	if gui_text == None:
@@ -535,4 +541,4 @@ def cinput(terminal_text, gui_text=None, input_type='text', title="CMAN"):
 		elif (input_type == 'boolean'):
 			return dialogs.askyesno(parent=tkinst, prompt=gui_text, title=title)
 
-	return input(terminal_text)
+	return input(terminal_text)