Remove unused, non-functional parameter 'eigenvalues_only'

SWITCHING_TO_NEW_INTERFACE.md

@@ -124,8 +124,6 @@ the user application):
 
    "debug"    can be one of { 0 | 1 }, will give more information case of an error if set to 1
 
-   "eigenvalues_only" can be one of { 0 | 1 }, if set to 1 solve will only compute the eigenvalues
-
 
 6. do the desired task with the *ELPA* library, which could be
    a) e%eigenvectors                  ! solve EV problem with solver as set by "set" method; computes eigenvalues AND eigenvectors

src/elpa_index.c

@@ -151,7 +151,6 @@ static const elpa_index_int_entry_t int_entries[] = {
         BOOL_ENTRY("debug", "Emit verbose debugging messages", 0),
         BOOL_ENTRY("print_flops", "Print FLOP rates on task 0", 0),
         BOOL_ENTRY("check_pd", "Check eigenvalues to be positive", 0),
-        PRIVATE_INT_ENTRY("eigenvalues_only", 0),
 };
 
 #define READONLY_DOUBLE_ENTRY(option_name, option_description) \