#65 early errors in new installation

[Jeremy Faden]

papco_start_modules should use module picker to pick user modules. Current dialog doesn't keep track of place, which is annoying.

Also:

IDL>
% Compiled module: PAPCO_MODULE_PICKER.
% XMANAGER: Caught unexpected error from client application. Message follows...
% Expression must be a scalar in this context: DIR.
% Execution halted at: PAPCO_MODULE_PICKER_REFRESH 51 /home/jbf/Desktop/papco/papco/papco_lib/papco_module_picker.pro
% PAPCO_MODULE_PICKER_EVENT 35 /home/jbf/Desktop/papco/papco/papco_lib/papco_module_picker.pro
% XMANAGER_EVLOOP_STANDARD 478 /usr/local/itt/idl64/lib/xmanager.pro
% XMANAGER 708 /usr/local/itt/idl64/lib/xmanager.pro
% PAPCO_MODULE_PICKER 137 /home/jbf/Desktop/papco/papco/papco_lib/papco_module_picker.pro
% PAPCO_CONFIGURATION_EVENT 39 /home/jbf/Desktop/papco/papco/papco/papco_create_main_widget.pro
% $MAIN$
% PAPCO_ADD_TO_PATH: ../Desktop/papco/papcoUsers/linux/papco_user/papco_user_mo
dules/cluster_caa/