Add #[derive(Clone, Copy... on all bitflags

This will make it easier to use them, e.g. I won't need to re-create `FunctionFlags` for registering multiple similar functions.

src/functions.rs

@@ -311,6 +311,7 @@ bitflags::bitflags! {
     /// Function Flags.
     /// See [sqlite3_create_function](https://sqlite.org/c3ref/create_function.html)
     /// and [Function Flags](https://sqlite.org/c3ref/c_deterministic.html) for details.
+    #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
     #[repr(C)]
     pub struct FunctionFlags: ::std::os::raw::c_int {
         /// Specifies UTF-8 as the text encoding this SQL function prefers for its parameters.

src/vtab/mod.rs

@@ -372,6 +372,7 @@ impl From<u8> for IndexConstraintOp {
 bitflags::bitflags! {
     /// Virtual table scan flags
     /// See [Function Flags](https://sqlite.org/c3ref/c_index_scan_unique.html) for details.
+    #[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
     #[repr(C)]
     pub struct IndexFlags: ::std::os::raw::c_int {
         /// Default

src/vtab/series.rs

@@ -28,7 +28,7 @@ const SERIES_COLUMN_STOP: c_int = 2;
 const SERIES_COLUMN_STEP: c_int = 3;
 
 bitflags::bitflags! {
-    #[derive(Clone, Copy)]
+    #[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
     #[repr(C)]
     struct QueryPlanFlags: ::std::os::raw::c_int {
         // start = $value  -- constraint exists