Major fee bump to come to more reasonable values

Starting on the higher side for testnet to see how it goes in
practice. Introduced constants for each smaller unit.

core/src/consensus.rs

@@ -25,8 +25,14 @@ use std::cmp::max;
 use ser;
 use core::target::Difficulty;
 
-/// A grin is divisible to 10^9, a nanogrin
+/// A grin is divisible to 10^9, following the SI prefixes
 pub const GRIN_BASE: u64 = 1_000_000_000;
+/// Milligrin, a thousand of a grin
+pub const MILLI_GRIN: u64 = GRIN_BASE / 1_000;
+/// Microgrin, a thousand of a milligrin
+pub const MICRO_GRIN: u64 = MILLI_GRIN / 1_000;
+/// Nanogrin, smallest unit, takes a billion to make a grin
+pub const NANO_GRIN: u64 = 1;
 
 /// The block subsidy amount
 pub const REWARD: u64 = 50 * GRIN_BASE;

pool/src/pool.rs

@@ -582,10 +582,9 @@ where
 			return Err(PoolError::OverCapacity);
 		}
 
-		// for a basic transaction (1 input, 2 outputs) -
-  // (-1 * 1) + (4 * 2) + 1 = 8
-  // 8 * 10 = 80
-  //
+    // for a basic transaction (1 input, 2 outputs) -
+    // (-1 * 1) + (4 * 2) + 1 = 8
+    // 8 * 10 = 80
 		if self.config.accept_fee_base > 0 {
 			let mut tx_weight = -1 * (tx.inputs.len() as i32) + (4 * tx.outputs.len() as i32) + 1;
 			if tx_weight < 1 {

pool/src/types.rs

@@ -24,6 +24,7 @@ use util::secp::pedersen::Commitment;
 
 pub use graph;
 
+use core::consensus;
 use core::core::block;
 use core::core::transaction;
 use core::core::hash;
@@ -52,7 +53,7 @@ impl Default for PoolConfig {
 }
 
 fn default_accept_fee_base() -> u64 {
-	10
+  consensus::MILLI_GRIN
 }
 fn default_max_pool_size() -> usize {
 	50_000

wallet/src/types.rs

@@ -32,6 +32,7 @@ use tokio_retry::strategy::FibonacciBackoff;
 
 
 use api;
+use core::consensus;
 use core::core::{transaction, Transaction};
 use core::ser;
 use keychain;
@@ -42,7 +43,7 @@ const DAT_FILE: &'static str = "wallet.dat";
 const LOCK_FILE: &'static str = "wallet.lock";
 const SEED_FILE: &'static str = "wallet.seed";
 
-const DEFAULT_BASE_FEE: u64 = 10;
+const DEFAULT_BASE_FEE: u64 = consensus::MILLI_GRIN;
 
 /// Transaction fee calculation
 pub fn tx_fee(input_len: usize, output_len: usize, base_fee: Option<u64>) -> u64 {