Set same error_bars as LIUQE weights for eqreconstruct IDSs

Modifications during WPCD working session on equilibrium reconstruction in Lisbon Jan.2020.

Open for discussion with @osauter @carpanes @ffelici.

matlab/TCV_IMAS/tcv_get_ids_pf_active.m

@@ -4,7 +4,7 @@ function [ids_pf_active,ids_pf_active_description,varargout] = tcv_get_ids_pf_ac
 %
 
 % Input pharser
-if exist('gdat_params')
+if exist('gdat_params','var')
   [ids_pf_active, params] = tcv_ids_headpart(shot, ids_pf_active_empty,'pf_active','homogeneous_time',0,'gdat_params',gdat_params,varargin{:});
 else
   [ids_pf_active, params] = tcv_ids_headpart(shot, ids_pf_active_empty,'pf_active','homogeneous_time',0,varargin{:});
@@ -21,7 +21,7 @@ end
 ids_pf_active.vertical_force = {};
 
 % cocos automatic transform
-if exist('ids_generic_cocos_nodes_transformation_symbolic') == 2
+if exist('ids_generic_cocos_nodes_transformation_symbolic','file')
   [ids_pf_active,cocoscoeff]=ids_generic_cocos_nodes_transformation_symbolic(ids_pf_active,'pf_active',gdat_params.cocos_in, ...
           gdat_params.cocos_out,gdat_params.ipsign_out,gdat_params.b0sign_out,gdat_params.ipsign_in,gdat_params.b0sign_in, ...
           gdat_params.error_bar,gdat_params.nverbose);