Convert remaining comments in /src to doxygen format

- Update comments in checkpoints to be doxygen compatible
- Update comments in checkqueue to be doxygen compatible
- Update coins to be doxygen compatible
- Fix comment typo in crypter.h
- Update licenses/copyright dates

Closes #5325 #5184 #5183 #5182

src/base58.h

@@ -1,16 +1,16 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
-// Copyright (c) 2009-2013 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
+// Copyright (c) 2009-2014 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
-//
-// Why base-58 instead of standard base-64 encoding?
-// - Don't want 0OIl characters that look the same in some fonts and
-//      could be used to create visually identical looking account numbers.
-// - A string with non-alphanumeric characters is not as easily accepted as an account number.
-// - E-mail usually won't line-break if there's no punctuation to break at.
-// - Double-clicking selects the whole number as one word if it's all alphanumeric.
-//
+/**
+ * Why base-58 instead of standard base-64 encoding?
+ * - Don't want 0OIl characters that look the same in some fonts and
+ *      could be used to create visually identical looking account numbers.
+ * - A string with non-alphanumeric characters is not as easily accepted as an account number.
+ * - E-mail usually won't line-break if there's no punctuation to break at.
+ * - Double-clicking selects the whole number as one word if it's all alphanumeric.
+ */
 #ifndef BITCOIN_BASE58_H
 #define BITCOIN_BASE58_H
 
@@ -70,10 +70,10 @@ inline bool DecodeBase58Check(const std::string& str, std::vector<unsigned char>
 class CBase58Data
 {
 protected:
-    // the version byte(s)
+    //! the version byte(s)
     std::vector<unsigned char> vchVersion;
 
-    // the actually encoded data
+    //! the actually encoded data
     typedef std::vector<unsigned char, zero_after_free_allocator<unsigned char> > vector_uchar;
     vector_uchar vchData;