xORBDB6/xUNBDB6: fix a constant

The commits listed below updated xORBDB6/xUNBDB6 with the aim of
improving numerical stability by avoiding the use of squared values.
With the exception of SORBDB6 these commits did not properly up a magic
constant called `ALPHA` in the code. SORBDB6 was initially updated
correctly before commit a015b21
inserted an incorrect value again.

The incorrect magic constant may lead to early returns with only
partially orthogonalized output vectors.

Relevant commits:
* 54b3964
* 6479e0f
* 94419e8

Author: christoph-conrads

SRC/cunbdb6.f

@@ -174,7 +174,7 @@ SUBROUTINE CUNBDB6( M1, M2, N, X1, INCX1, X2, INCX2, Q1, LDQ1, Q2,
 *
 *     .. Parameters ..
       REAL               ALPHA, REALONE, REALZERO
-      PARAMETER          ( ALPHA = 0.01E0, REALONE = 1.0E0,
+      PARAMETER          ( ALPHA = 0.1E0, REALONE = 1.0E0,
      $                     REALZERO = 0.0E0 )
       COMPLEX            NEGONE, ONE, ZERO
       PARAMETER          ( NEGONE = (-1.0E0,0.0E0), ONE = (1.0E0,0.0E0),

SRC/dorbdb6.f

@@ -174,7 +174,7 @@ SUBROUTINE DORBDB6( M1, M2, N, X1, INCX1, X2, INCX2, Q1, LDQ1, Q2,
 *
 *     .. Parameters ..
       DOUBLE PRECISION   ALPHA, REALONE, REALZERO
-      PARAMETER          ( ALPHA = 0.01D0, REALONE = 1.0D0,
+      PARAMETER          ( ALPHA = 0.1D0, REALONE = 1.0D0,
      $                     REALZERO = 0.0D0 )
       DOUBLE PRECISION   NEGONE, ONE, ZERO
       PARAMETER          ( NEGONE = -1.0D0, ONE = 1.0D0, ZERO = 0.0D0 )

SRC/sorbdb6.f

@@ -174,7 +174,7 @@ SUBROUTINE SORBDB6( M1, M2, N, X1, INCX1, X2, INCX2, Q1, LDQ1, Q2,
 *
 *     .. Parameters ..
       REAL               ALPHA, REALONE, REALZERO
-      PARAMETER          ( ALPHA = 0.01E0, REALONE = 1.0E0,
+      PARAMETER          ( ALPHA = 0.1E0, REALONE = 1.0E0,
      $                     REALZERO = 0.0E0 )
       REAL               NEGONE, ONE, ZERO
       PARAMETER          ( NEGONE = -1.0E0, ONE = 1.0E0, ZERO = 0.0E0 )

SRC/zunbdb6.f

@@ -174,7 +174,7 @@ SUBROUTINE ZUNBDB6( M1, M2, N, X1, INCX1, X2, INCX2, Q1, LDQ1, Q2,
 *
 *     .. Parameters ..
       DOUBLE PRECISION   ALPHA, REALONE, REALZERO
-      PARAMETER          ( ALPHA = 0.01D0, REALONE = 1.0D0,
+      PARAMETER          ( ALPHA = 0.1D0, REALONE = 1.0D0,
      $                     REALZERO = 0.0D0 )
       COMPLEX*16         NEGONE, ONE, ZERO
       PARAMETER          ( NEGONE = (-1.0D0,0.0D0), ONE = (1.0D0,0.0D0),