Add code to create big bitvecs for testing

Cargo.toml

@@ -11,6 +11,7 @@ failure = "0.1.1"
 serde = "1.0.66"
 serde_derive = "1.0.66"
 bincode = "1.0.1"
+rand = "0.5.4"
 
 [dev-dependencies]
 criterion = "0.2"

create_bitvec.rs

+extern crate bv;
+extern crate rand;
+extern crate fp_succinct_trees_1;
+
+use bv::{BitVec, BitsMut};
+use fp_succinct_trees_1::bp_tree::*;
+use fp_succinct_trees_1::common::succinct_tree::SuccinctTree;
+use fp_succinct_trees_1::common::errors::InvalidBitvecError;
+
+fn main() {
+    while true {
+        let tree: Result<BPTree<i32>, InvalidBitvecError> = BPTree::from_bitvec(generate_bits());
+        match tree {
+            Ok(tree) => {
+                println!("Found {:?}", tree);
+                tree.save_to("testdata/bphuge.benchdata".to_string());
+                break;
+            },
+            Err(_) => {}
+        }
+    }
+
+}
+
+
+
+fn generate_bits() -> BitVec<u8> {
+    let mut bv: BitVec<u8> = BitVec::new();
+    let mut excess = 0;
+    for i in 0..10000 {
+        let bit = rand::random::<bool>();
+        bv.push(bit);
+        if bit {
+            excess += 1;
+        } else { excess -= 1; }
+    }
+    while excess != 0 {
+        if excess < 0 {
+            bv.push( true);
+            excess += 1;
+        } else {
+            bv.push(false);
+            excess -= 1;
+        }
+    }
+    // println!("Generated bv: {:?}", bv);
+    bv
+}
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