all: use fixdocs tool to store package documentation in doc.go

Add copyright header to doc.go

lapack/lapack64/doc.go

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+// Copyright ©2017 The gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package lapack64 provides a set of convenient wrapper functions for LAPACK
+calls, as specified in the netlib standard (www.netlib.org).
+
+The native Go routines are used by default, and the Use function can be used
+to set an alternative implementation.
+
+If the type of matrix (General, Symmetric, etc.) is known and fixed, it is
+used in the wrapper signature. In many cases, however, the type of the matrix
+changes during the call to the routine, for example the matrix is symmetric on
+entry and is triangular on exit. In these cases the correct types should be checked
+in the documentation.
+
+The full set of Lapack functions is very large, and it is not clear that a
+full implementation is desirable, let alone feasible. Please open up an issue
+if there is a specific function you need and/or are willing to implement.
+*/
+package lapack64 // import "gonum.org/v1/gonum/lapack/lapack64"